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由于采取蓝光芯片与黄色荧光粉YAG:Ce3+复合产生的空封白光数码管存在光通量低的缺点,提出采用点胶技术,利用环氧树脂折射率高可以增加数码管光子逸出数、光衰效应低等优点,提高数码管的发光强度和发光效率。实验测试了各20个空封贴片白光数码管、不封装蓝光数码管和点胶压盖白光数码管,数码管基板固晶蓝光芯片主波长为460—462.5nm,使用透明环氧树脂胶、YAG:Ce3+黄色荧光粉,在20mA正向电流作用下,测试光通量、发光强度、发光效率3个指标,获得3种数码管的曲线比较图。结果显示,应用点胶压盖技术数码管的发光强度和发光效率比空封数码管分别提高60.94%和46.54%,测试结果较好地显示了应用点胶压盖技术数码管的优点。
Due to the shortcoming of low luminous flux of empty white light digital tube produced by YAG: Ce3 + composite of blue light chip and yellow phosphor, it is proposed to use dispensing technology to increase the number of photon escapes and the light decay effect by using the high refractive index of epoxy resin Lower advantages, improve the digital tube luminous intensity and luminous efficiency. Experimental tests of the 20 empty white SMD LED digital tube, not packaged blue digital tube and white LED gland, digital tube substrate solid crystal blue chip dominant wavelength of 460-462.5nm, the use of transparent epoxy glue, YAG: Ce3 + yellow phosphor, under the action of 20mA forward current, the luminous flux, luminous intensity, luminous efficiency of three indicators to obtain three kinds of digital tube curve comparison chart. The results showed that the luminous intensity and luminous efficiency of the digital tube using the dispensing gland technology increased by 60.94% and 46.54% respectively compared with the empty digital tube. The test results better show the advantages of the digital tube using the dispensing gland technology.