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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.8
- 수록면
- 389 - 395 (7page)
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This paper investigates a method to improve the lighting performance of white light-emitting diodes(WLEDs), which are packaged using two separate remote phosphor layers, a yellow-emitting YAG:Cephosphor layer and a red-emitting α-SrO·3B<sub>2</sub>O<sub>3</sub>:Sm<sup>2+</sup> phosphor layer. The thicknesses of these two layersare 800 μm and 200 μm, respectively. Both of them are examined in conditions where the averagecorrelated color temperatures (CCT) are 7700 K and 8500 K. For this two-layer model, the concentrationof red phosphor is varied from 2% to 30% in the upper layer, while in the lower layer the yellow phosphorconcentration is kept at 15%. It was found interestingly that the lighting properties such as color renderingindex (CRI) and luminous flux are enhanced significantly, while the color uniformity is maintained ina relatively close range to the one of one-layer configuration (measured at the same correlated colortemperature). Besides, the transmitted and reflected light of each phosphor layer are revised by combiningKubelka-Munk and Mie-Lorenz theories. Through analysis, it is demonstrated that the packagingconfiguration of two-layer remote phosphor that employs red-emitting α-SrO·3B<sub>2</sub>O<sub>3</sub>:Sm<sup>2+</sup> phosphor particlesprovides a practical solution for general WLEDs lighting.
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