阅读说明：本技术 一种紫外led封装胶质量的评估方法 (Method for evaluating quality of ultraviolet LED packaging adhesive ) 是由 高春瑞 郑剑飞 涂舒 苏水源 于 2021-06-10 设计创作，主要内容包括：本发明提供一种紫外LED封装胶质量的评估方法,包括如下步骤：A1,提供多组实验组,每组实验组均设置标有刻度尺的透明容器,在每组实验组的透明容器内倒入相同高度的透明胶,且多组实验组的透明容器内的透明胶均不相同；A2,待透明胶平稳后,往每组实验组的透明容器的透明胶表面放置相同的荧光粉颗粒；A3,同时加热多组实验组的透明胶；A4,记录同一实验组的荧光粉颗粒在相同温度下不同时间段的沉降位置,得到同一组实验组中的荧光粉颗粒的沉降速率；A5,对比不同实验组之间荧光粉颗粒的沉降速率,沉降速率越低代表采用这组实验组的透明胶进行制备的封装胶质量越好。实现快速评估和选择哪种透明胶最适合制备紫外LED的封装胶。(The invention provides an evaluation method of ultraviolet LED packaging adhesive quality, which comprises the following steps: a1, providing a plurality of groups of experiment groups, wherein each group of experiment group is provided with a transparent container marked with a graduated scale, transparent glue with the same height is poured into the transparent container of each group of experiment group, and the transparent glue in the transparent containers of the plurality of groups of experiment groups is different; a2, after the transparent adhesive tape is stable, placing the same fluorescent powder particles on the surface of the transparent adhesive tape of the transparent container of each experimental group; a3, heating multiple groups of transparent glue of experiment groups at the same time; a4, recording the sedimentation positions of the fluorescent powder particles of the same experimental group in different time periods at the same temperature to obtain the sedimentation rate of the fluorescent powder particles in the same experimental group; a5, comparing the sedimentation rates of the phosphor particles among different experimental groups, the lower the sedimentation rate represents the better the quality of the packaging adhesive prepared by the transparent adhesive of the experimental group. And the rapid evaluation and the selection of which transparent adhesive is most suitable for preparing the packaging adhesive of the ultraviolet LED are realized.)

1. The method for evaluating the quality of the ultraviolet LED packaging adhesive is characterized by comprising the following steps of:

a1, providing a plurality of groups of experiment groups, wherein each group of experiment group is provided with a transparent container marked with a graduated scale, transparent glue with the same height is poured into the transparent container of each group of experiment group, and the transparent glue in the transparent containers of the plurality of groups of experiment groups is different;

a2, after the transparent adhesive tape is stable, placing the same fluorescent powder particles on the surface of the transparent adhesive tape of the transparent container of each experimental group;

a3, heating multiple groups of transparent glue of experiment groups at the same time;

a4, recording the sedimentation positions of the fluorescent powder particles of the same experimental group in different time periods at the same temperature to obtain the sedimentation rate of the fluorescent powder particles in the same experimental group;

a5, comparing the sedimentation rates of the phosphor particles among different experimental groups, the lower the sedimentation rate represents the better the quality of the packaging adhesive prepared by the transparent adhesive of the experimental group.

2. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 1, wherein: step A3 and step a4 are repeated cycles of detecting the settling rate of the phosphor particles at different heating temperatures, and then step a5 is performed after the tests at all temperatures are completed.

3. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 2, wherein: in the step A3, firstly, the transparent adhesive is heated to the dispensing environment temperature when the ultraviolet LED is packaged, the step A4 is carried out, the sedimentation positions of the fluorescent powder particles of the same experimental group in different time periods at the dispensing environment temperature are recorded, and the sedimentation rate is obtained; after the completion, returning to the step A3, heating the transparent adhesive to the baking environment temperature when the LED is packaged, entering the step A4, and recording the sedimentation positions of the fluorescent powder particles of the same experimental group in different time periods at the baking environment temperature to obtain the sedimentation rate; and finally, step A5 is carried out, the sedimentation rate of the fluorescent powder particles among different experimental groups is compared, and only when the sedimentation rate is low at two temperatures, the better the quality of the packaging adhesive prepared by the transparent adhesive of the experimental group is.

4. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 3, wherein: the time gluing environment temperature for packaging the ultraviolet LED is 25 ℃; the baking environment temperature is 100 ℃ when the LED is packaged.

5. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 1, wherein: a3-4 is further included between the steps A3 and A4, and an excitation light source is provided to irradiate the phosphor particles with the excitation light source so as to excite the phosphor particles to emit light.

6. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 5, wherein: the excitation light source is a blue light source, and the excitation light source emits blue light to excite the fluorescent powder particles to emit white light.

7. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 6, wherein: the excitation light source is a blue light LED light source.

8. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 1, wherein: in step a3, a constant temperature heating device with temperature control is provided, and the transparent adhesive tapes of the plurality of experimental groups are simultaneously heated by the constant temperature heating device.

9. The method for evaluating the quality of the ultraviolet LED packaging adhesive according to claim 1, wherein: the transparent container is a glass beaker.

Technical Field

The invention relates to the field of ultraviolet LED packaging processes, in particular to an evaluation method for quality of ultraviolet LED packaging glue.

Background

The existing white light source which is generally applied excites fluorescent powder to form white light through a blue light chip, the physiological health of people is influenced due to the biological hazard of the blue light, and the existing market adopts an ultraviolet chip to substitute the traditional blue light chip to excite the fluorescent powder to be used as a lighting lamp bead and is widely used.

The scheme that the ultraviolet chip excites the fluorescent powder can reduce the harm of blue light, and can play a role in sterilization in specific occasions. However, the ultraviolet LED chip has low excitation efficiency to the phosphor, and uneven distribution of the phosphor directly affects the yield of the product.

In actual production, the dispensing process cannot timely send the product subjected to dispensing into an oven for baking for the first time to cause primary precipitation of the fluorescent powder, and after the product enters the oven for heating, the fluidity of the colloid is enhanced, the precipitation speed of the fluorescent powder is increased, and secondary precipitation is caused; the sedimentation of the fluorescent powder causes the uneven distribution of the fluorescent powder, thereby influencing the targeting concentration of ultraviolet lamp bead products. Therefore, a method for rapidly evaluating the quality of the ultraviolet LED packaging glue is needed.

Disclosure of Invention

Therefore, in order to solve the above problems, the present invention provides a method for evaluating the quality of an ultraviolet LED packaging adhesive.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

an evaluation method for the quality of ultraviolet LED packaging glue comprises the following steps:

a1, providing a plurality of groups of experiment groups, wherein each group of experiment group is provided with a transparent container marked with a graduated scale, transparent glue with the same height is poured into the transparent container of each group of experiment group, and the transparent glue in the transparent containers of the plurality of groups of experiment groups is different;

a2, after the transparent adhesive tape is stable, placing the same fluorescent powder particles on the surface of the transparent adhesive tape of the transparent container of each experimental group;

a3, heating multiple groups of transparent glue of experiment groups at the same time;

a4, recording the sedimentation positions of the fluorescent powder particles of the same experimental group in different time periods at the same temperature to obtain the sedimentation rate of the fluorescent powder particles in the same experimental group;

a5, comparing the sedimentation rates of the phosphor particles among different experimental groups, the lower the sedimentation rate represents the better the quality of the packaging adhesive prepared by the transparent adhesive of the experimental group.

Further, steps A3 and a4 are repeated cycles of detecting the settling rate of the phosphor particles at different heating temperatures, and then step a5 is performed after all the temperature tests are completed.

Further, in the step A3, the transparent adhesive is heated to the dispensing environment temperature when the ultraviolet LED is packaged, the step a4 is performed, and the sedimentation positions of the phosphor particles of the same experimental group in different time periods at the dispensing environment temperature are recorded, so as to obtain the sedimentation rate; after the completion, returning to the step A3, heating the transparent adhesive to the baking environment temperature when the LED is packaged, entering the step A4, and recording the sedimentation positions of the fluorescent powder particles of the same experimental group in different time periods at the baking environment temperature to obtain the sedimentation rate; and finally, step A5 is carried out, the sedimentation rate of the fluorescent powder particles among different experimental groups is compared, and only when the sedimentation rate is low at two temperatures, the better the quality of the packaging adhesive prepared by the transparent adhesive of the experimental group is.

Further, the time gluing environment temperature for packaging the ultraviolet LED is 25 ℃; the baking environment temperature is 100 ℃ when the LED is packaged.

Further, a step A3-4 is included between the steps A3 and a4, in which an excitation light source is provided to irradiate the phosphor particles with the excitation light source, so as to excite the phosphor particles to emit light.

Further, the excitation light source is a blue light source, and the excitation light source emits blue light to excite the fluorescent powder particles to emit white light.

Further, the excitation light source is a blue light LED light source.

Further, in step a3, a constant temperature heating device with temperature control is provided, and the transparent adhesives of the multiple experimental groups are simultaneously heated by the constant temperature heating device.

Further, the transparent container is a glass beaker.

Through the technical scheme provided by the invention, the method has the following beneficial effects:

the method is used for detecting the sedimentation rate of the fluorescent powder particles in different transparent adhesives to judge which transparent adhesive is most suitable for preparing the packaging adhesive of the ultraviolet LED, so that rapid evaluation and selection are realized.

Drawings

FIG. 1 is a block flow diagram illustrating a method for evaluating the quality of an ultraviolet LED packaging adhesive in an embodiment;

FIG. 2 is a schematic diagram of the testing apparatus in the embodiment.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Fig. 1 shows a method for evaluating the quality of an ultraviolet LED packaging adhesive according to this embodiment, and fig. 2 shows a testing apparatus for implementing the method. The evaluation method comprises the following steps:

a1, providing a plurality of experimental groups, wherein each experimental group is provided with a transparent container 20 marked with a graduated scale 21 as shown in FIG. 2, and specifically, the graduated scale 21 has a scale value of 0-5cm and is gradually increased from bottom to top; transparent glue (not shown) of the same height is poured into the transparent containers 20 of each set of experiment groups, and the transparent glue in the transparent containers 20 of the plurality of sets of experiment groups is different.

As in this embodiment, two experimental groups, namely a first experimental group and a second experimental group, are provided; the number of the transparent containers 20 in each set is preferably set to two or more to prevent errors. The glue A is poured into the transparent containers 20 of the first experimental group, the glue B is poured into the transparent containers 20 of the second experimental group, and the heights of the transparent glue in the transparent containers 20 of the two experimental groups are the same, namely, the transparent glue is kept on the same scale value, such as the transparent glue is kept on the scale value of 5 cm.

A2, after the transparent adhesive is stable, placing the same fluorescent powder particles 1 on the surface of the transparent adhesive of the transparent container 20 of each experimental group; as in this embodiment, phosphor particles 1 having a particle size of 50-60um are dropped.

A3, heating multiple groups of transparent glue of experiment groups at the same time;

specifically, in this embodiment, the transparent containers 20 of the two experimental groups are placed in a constant temperature heating device 10 with temperature control, such as an electric baking tray or an oven, and the transparent adhesives of the two experimental groups are simultaneously heated by the constant temperature heating device 10. So that the heating conditions of each experimental group are the same and the temperature is controllable.

A4, recording the sedimentation positions of the fluorescent powder particles 1 in the same experimental group in different time periods at the same temperature to obtain the sedimentation rate of the fluorescent powder particles 1 in the same experimental group;

specifically, the recorded data is a scale value corresponding to the position of the phosphor particle 1.

A5, comparing the sedimentation rates of the phosphor particles 1 among different experimental groups, the lower the sedimentation rate represents the better the quality of the packaging adhesive prepared by the transparent adhesive of the experimental group.

The method is used for detecting the sedimentation rate of the fluorescent powder particles in different transparent adhesives to judge which transparent adhesive is most suitable for preparing the packaging adhesive of the ultraviolet LED, so that rapid evaluation and selection are realized.

More preferably, for more accurate data, the sedimentation rates at different temperatures need to be detected; thus, steps A3 and a4 are repeated cycles of detecting the settling rate of phosphor particles 1 at different heating temperatures, and then step a5 is performed after the tests at all temperatures are completed.

Specifically, it is preferable to use an environment temperature simulating the ultraviolet LED package, that is, the environment temperature of the ultraviolet LED package has two temperatures, including a dispensing environment temperature at the time of dispensing, which is 25 ℃, and a baking environment temperature at the time of baking and hardening, which is 100 ℃.

The specific mode is as follows: in the step A3, firstly, the transparent adhesive is heated to the dispensing environment temperature when the ultraviolet LED is packaged, namely 25 ℃, the step A4 is carried out, the sedimentation positions of the fluorescent powder particles 1 of the same experimental group in different time periods at the dispensing environment temperature are recorded, and the sedimentation rate is obtained; the sedimentation position of the phosphor particles 1 of the first experimental group at the dispensing ambient temperature for 60 minutes at 5 minute intervals was recorded as such, thereby obtaining the sedimentation rate at that temperature. Likewise, the settling position of the phosphor particles 1 of the second experimental group was recorded every 5 minutes at the dispensing ambient temperature for 60 minutes, thereby obtaining the settling rate at that temperature. Specifically, the data of the sedimentation position of the phosphor particle 1 at the dispensing ambient temperature are shown in table 1, and it can be found that the sedimentation rate of the phosphor particle 1 at the a glue is lower than that at the B glue at the temperature.

TABLE 1 sedimentation position data of phosphor particles at dispensing ambient temperature

And returning to the step A3 after the completion, heating the transparent adhesive to the baking environment temperature of the LED package, namely 100 ℃, entering the step A4, and recording the sedimentation positions of the fluorescent powder particles 1 of the first experimental group at intervals of 5 minutes within 60 minutes of the baking environment temperature so as to obtain the sedimentation rate at the temperature. Likewise, the settling position of the phosphor particles 1 of the second experimental group at the baking ambient temperature for 60 minutes at 5 minute intervals was recorded, thereby obtaining the settling rate at that temperature. Specifically, the data of the sedimentation position of the phosphor particles 1 at the baking ambient temperature are shown in table 2.

TABLE 2 sedimentation position data of phosphor particles at baking ambient temperature

The evaluation is performed in step a5, and it can be seen from the test data that, although the sedimentation rate of the phosphor particles 1 in the a glue is lower than that in the B glue at the dispensing ambient temperature, the sedimentation position of the phosphor particles 1 in the a glue reaches the lowest point at the baking ambient temperature, as if the free fall sinks. While in the sedimentation of gum B, it almost leveled off in about 55 minutes. In the production, the glue dispensing environment temperature and the baking environment temperature are needed, so that the quality of the packaging glue prepared by the transparent glue of the experimental group is better only if the sedimentation rate is low at the two temperatures. In conclusion, the packaging adhesive prepared by the adhesive B has better quality.

Of course, in other embodiments, a temperature may be directly used for testing, such as directly using the temperature of the baking environment.

Further, in order to more intuitively confirm the position of the phosphor, in the present embodiment, a step A3-4 is further included between the steps A3 and a4, in which an excitation light source 30 is provided, and the phosphor particles 1 are irradiated by the excitation light source 30 to excite the phosphor particles 1 to emit light. So, can make the tester more quick, the position of audio-visual confirmation phosphor powder granule 1, the effect is better. More preferably, the excitation light source 30 is a blue light source, and more preferably a blue LED light source, and the excitation light source 30 emits blue light to excite the phosphor particles 1 to emit white light. The blue light is adopted to excite the fluorescent powder particles 1, the excitation efficiency is high, the excited white light is obviously compared with the blue light, and the positions of the fluorescent powder particles 1 can be better confirmed. Of course, in other embodiments, other light sources, such as an ultraviolet light source, capable of exciting phosphor particles can be used as the excitation light source 30.

Furthermore, the transparent container 20 is a glass beaker, so that the cost is low and the materials are easily available. Of course, in other embodiments, this is not limiting.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.