Abstract

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:Ce phosphor layer and a red-emitting α-SrO·3B2O3:Sm2+ phosphor layer. The thicknesses of these two layers are 800 μm and 200 μm, respectively. Both of them are examined in conditions where the average correlated color temperatures (CCT) are 7700 K and 8500 K. For this two-layer model, the concentration of red phosphor is varied from 2% to 30% in the upper layer, while in the lower layer the yellow phosphor concentration is kept at 15%. It was found interestingly that the lighting properties such as color rendering index (CRI) and luminous flux are enhanced significantly, while the color uniformity is maintained in a relatively close range to the one of one-layer configuration (measured at the same correlated color temperature). Besides, the transmitted and reflected light of each phosphor layer are revised by combining Kubelka-Munk and Mie-Lorenz theories. Through analysis, it is demonstrated that the packaging configuration of two-layer remote phosphor that employs red-emitting α-SrO·3B2O3:Sm2+ phosphor particles provides a practical solution for general WLEDs lighting.

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  1. P.-C. Wang, Y.-K. Su, C.-L. Lin, and G.-S. HuangImproving Performance and Reducing Amount of Phosphor Required in Packaging of White LEDs With TiO2-Doped SiliconeIEEE Electron Device Lett.2014356657659
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  14. R. Hu, B. Cao, Y. Zou, Y. Zhu, and X. LuoModeling the light extraction efficiency of Bi-layer phosphors in white LEDsIEEE Photon. Technol. Lett.20132512
  15. C. H. Chiang, S. J. Gong, T. S. Zhan, and S. Y. ChuWhite light-emitting diodes with high color rendering index and tunable color temperature fabricated using separated phosphor layer structureIEEE Electron Device Lett.2016
  16. Y. Zhu and N. NarendranInvestigation of remote-phosphor white light-emitting diodes with multi-phosphor layersJpn. J. Appl. Phys.20104910R3100203
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  21. B. J. BrinkworthInterpretation of the Kubelka - Munk coefficients in reflection theoryAppl. Opt.1972114341435
  22. H. ReissRadiative Transfer in Nontransparent Dispersed MediaSpringerBerlin1988
  23. J. Zhong, M. Xie, Z. Ou, R. Zhang, M. Huang, and F. ZhaoMie theory simulation of the effect on light extraction by 2-D nanostructure fabricationProceedings Symposium on Photonics and Optoelectronics (SOPO)IEEE2011
  24. G. Wyszecki and W. S. StilesColor science - concepts and methods, quantitative data and formulae2nd editionWileyNew York1982156
  25. H. Chen and S. Y. (Ron) HuiDynamic prediction of correlated color temperature and color rendering index of phosphor-coated white light-emitting diodesIEEE Trans. Ind. Electron.2014612

Other (25)

P.-C. Wang, Y.-K. Su, C.-L. Lin, and G.-S. HuangImproving Performance and Reducing Amount of Phosphor Required in Packaging of White LEDs With TiO2-Doped SiliconeIEEE Electron Device Lett.2014356657659

M. Arik, C. Becker, S. Weaver, and J. PetroskiThermal management of LEDs: package to the systemProc. SPIE2004518764

R. Mueller-Mach, G. O. Mueller, M. R. Krames, and T. TrottierHigh-power phosphor converted light-emitting diodes based on III-nitridesIEEE J. Sel. Top. Quantum Electron.200282339345

J. P. You, N. T. Tran, Y. C. Lin, Y. He, and F. G. ShiPhosphor-concentration-dependent characteristics of white LEDs under different current regulation modesJ. Electron. Mater.2009386761766

N. Narendran, Y. Gu, J. P. Freyssinier-Nova, and Y. ZhuExtracting phosphor-scattered photons to improve white LED efficiencyPhys. Status Solidi., A Appl. Mater. Sci.20052026R60R62

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, and Y. ParkAnalysis of high-power packages for phosphor based white-light-emitting diodesAppl. Phys. Lett.20058624243505243507

J. K. Kim, H. Luo, E. F. Schubert, J. Cho, C. Sone, and Y. ParkStrongly enhanced phosphor efficiency in GaInN white light-emitting diodes using remote phosphor configuration and diffuse reflector cupJpn. J. Appl. Phys.20054421L649L651

K. K. Seong, T. W. Yoo, B.-S. Kim, S. M. Lee, Y. S. Lee, and L. S. ParkWhite LED packaging with layered encapsulation of quantum dots and optical propertiesJ. Mol. Cryst. Liq. Cryst.201256413341

S. C. Allen and A. J. StecklELiXIR - Solid-state luminaire with enhanced light extraction by internal reflectionJ. Disp. Technol.200732155159

S. C. Allen and A. J. StecklA nearly ideal phosphor-converted white light-emitted diodeJ. Appl. Phys.200892143309143311

H. Masui, S. Nakamura, and S. P. DenbaarsEffects of phosphor application geometry on white light-emitting diodesJpn. J. Appl. Phys.20064534L910L912

N. D. Q. Anh, M. F. Lai, H. Y. Ma, and H. Y. LeeEnhancing of correlated color temperature uniformity for multichip white light LEDs by adding SiO2 to phosphor layerJ. Chin. Inst. Eng.2015383

R. Mueller-Mach, G. Mueller, M. R. Krames, H. A. Hoppe, F. Stadler, W. Schnick, T. Juestel, and P. SchmidtHighly efficient all-nitride phosphor-converted white light emitting diodePhys. Status Solidi A2005202917271732

R. Hu, B. Cao, Y. Zou, Y. Zhu, and X. LuoModeling the light extraction efficiency of Bi-layer phosphors in white LEDsIEEE Photon. Technol. Lett.20132512

C. H. Chiang, S. J. Gong, T. S. Zhan, and S. Y. ChuWhite light-emitting diodes with high color rendering index and tunable color temperature fabricated using separated phosphor layer structureIEEE Electron Device Lett.2016

Y. Zhu and N. NarendranInvestigation of remote-phosphor white light-emitting diodes with multi-phosphor layersJpn. J. Appl. Phys.20104910R3100203

W. M. Yen and M. J. WeberInorganic phosphors: compositions, preparation and optical propertiesCRC PressWashington, D. C.2004

T. H. Q. Minh, N. H. K. Nhan, and N. D. Q. AnhRedemitting α-SrO·3B2O3:Sm2+phosphor: An innovative application for increasing color quality and luminous flux of remote phosphor white LEDsJ. Chin. Inst. Eng.2016

P. Kubelka and F. MunkEin beitrag zur optik der farbanstricheZ. Tech. Phys.193112593601

P. S. Mudgett and L. W. RichardsMultiple scattering calculations for technologyAppl. Opt.19711014851501

B. J. BrinkworthInterpretation of the Kubelka - Munk coefficients in reflection theoryAppl. Opt.1972114341435

H. ReissRadiative Transfer in Nontransparent Dispersed MediaSpringerBerlin1988

J. Zhong, M. Xie, Z. Ou, R. Zhang, M. Huang, and F. ZhaoMie theory simulation of the effect on light extraction by 2-D nanostructure fabricationProceedings Symposium on Photonics and Optoelectronics (SOPO)IEEE2011

G. Wyszecki and W. S. StilesColor science - concepts and methods, quantitative data and formulae2nd editionWileyNew York1982156

H. Chen and S. Y. (Ron) HuiDynamic prediction of correlated color temperature and color rendering index of phosphor-coated white light-emitting diodesIEEE Trans. Ind. Electron.2014612

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