Effects of BaSO4 nano-particles on the enhancement of the optical performance of white LEDs
| Main Author: | Quốc Anh, Nguyễn Đoàn |
|---|---|
| Format: | Article info eJournal |
| Bahasa: | eng |
| Terbitan: |
Universitas Ahmad Dahlan
, 2021
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| Subjects: | |
| Online Access: |
http://journal.uad.ac.id/index.php/TELKOMNIKA/article/view/16855 |
Daftar Isi:
- The effects of BaSO4 nanoparticles on the luminous flux and the color uniformity of WLEDs have been analyzed. The mixture of BaSO4 and silicone placed on the yellow phosphor layer benefits the internal light scattering and thus probably enhances the angular correlated color temperature (CCT) homogeneity. Specifically, the blue-light intensity at large angles tend to increase and the CCT deviations show a remarkable degradation when BaSO4 is added. In addition to this, the BaSO4-silicone composite modifies the refractive index of the air-phosphor layer interface to an appropriate value, and thus, the luminous efficiency increases. The results show that the CCT deviations is reduced by 580 K, from 1000 K to 420 K, within the angle range from -70 0 to +700 with BaSO4 in the phosphor structure. The increase in luminous flux is also recorded by 2.25%, in comparison with that of the non-BaSO4 traditional structure, at the 120 mA driving current. Hence, integrating BaSO4 nanoparticles into the remote phosphor structure can contributes to achieving either higher lumen output or better CCT uniformity.