Using SiO 2 nano-particles for better color uniformity and lumen output in 8500 K conformal and in-cup white LEDs
| Main Authors: | My Hanh Nguyen Thi, Nguyen Thi Phuong Loan, Thuc Minh Bui, Tri-Vien Vu |
|---|---|
| Format: | Article Journal |
| Terbitan: |
, 2021
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5145334 |
Daftar Isi:
- In the effort of improving the performance of white light LEDs devices (WLEDs), the SiO 2 nano-particles were applied and have shown a significant impact on the optical properties. Specifically, the light output of the lighting devices is enhanced when a mixture of SiO 2 particles and silicone gel is diffused on the encapsulation layer surface. This enhancement is the result of light scattering from SiO 2 that strengthens the emitted blue light at further angles and reduces the color discrepancy. The evidence is that CCT deviation in SiO 2 -doped structure decline from 1000 K to 420 K in -70° to 70°. In addition, the SiO 2 with refractive index in between the phosphor material and outside environment allows light to be emitted outward more effectively. This lighting enhancement of SiO 2 -doped structure increases the lumen output by 2.25% at 120 mA power source in comparison to structure without SiO 2 . These experimental outcomes suggest that SiO 2 is an effective material to add in WLEDs structure for better lighting efficiency.