Abstract

Due to optimal advances such as chromatic performance, durability, low power consumption, high efficiency, long-lifetime, and excellent environmental friendliness, white LEDs (WLEDs) are widely used in vehicle front lighting, backlighting, decorative lighting, street lighting, and even general lighting. In this paper, the remote packaging WLEDs (RP-WLEDs) with bi-layer red-emitting Sr2Si5N8: Eu2+ and yellow-emitting YAG:Ce phosphor was proposed and investigated. The simulation results based on the MATLAB software and the commercial software Light Tools indicated that the color rendering index (CRI) of bi-layer phosphor RP-WLEDs had a significant increase. The CRI had a considerable increase from 72 to 94. In conclusion, the results showed that bi-layer red-emitting Sr2Si5N8:Eu2+ and yellow-emitting YAG:Ce phosphor could be a prospective approach for manufacturing RP-WLEDs with enhanced optical properties.

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  1. S. C. Allen and A. J. StecklA nearly ideal phosphor-converted white light-emitted diodeJ. Appl. Phys.200892143309143311
  2. H. Masui, S. Nakamura, and S. P. DenbaarsEffects of phosphor application geometry on white light-emitting diodesJpn. J. Appl. Phys.20064534910912
  3. 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.2015383297303
  4. N. D. Q. Anh and H. Y. LeeImproving the angular color uniformity and the lumen output for white LED lamps by green Ce0.67 Tb0.33 MgAl11 O19:Ce,Tb. PhosphorJ. Chin. Inst. Eng.201640871875
  5. M. H. CrawfordLEDs for solid-state lighting: performance challenges and recent advancesIEEE J. Sel. Topics Quantum Electron20091510281040
  6. H. Run, L. Xiaobing, F. Han, and L. ShengEffect of phosphor settling on the optical performance of phosphor-converted white light-emitting diodeJ. Lumin.2012132512521256
  7. H. Zheng, X. Luo, R. Hu, B. Cao, X. Fu, Y. Wang, and S. LiuConformal phosphor coating using capillary micro-channel for controlling color deviation of phosphor-converted white light-emitting diodesOpt. Express20122050925098
  8. R. Hu, X. Luo, and S. LiuStudy on the optical properties of conformal coating light-emitting diode by monte carlo simulationIEEE Photon. Technol. Lett.20112316731675
  9. I. ZhmakinEnhancement of light extraction from light emitting diodesPhys. Rep.2011498189241
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  12. Z. Y. Liu, C. Li, B. H. Yu, Y. H. Wang, and H. B. NiuEffects of YAG:Ce phosphor particle size on luminous flux and angular color uniformity of phosphor-converted white LEDsJ. Disp. Technol.20128329335
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  15. X. Piao, T. Horikawa, H. Hanzawa, and K. MachidaCharacterization and luminescence properties of Sr2Si5N8:Eu2+ phosphor for white light-emitting-diode illuminationAppl. Phys. Lett.200688161908
  16. H. Nersisyan, H. I. Won, and C. W. WonHighly effective synthesis and photoluminescence of Sr2Si5N8:Eu2+ red-emitting phosphor for LEDsChem. Commun.2011474311897
  17. B. Zhang, J.-W. Wang, L.-Y. Hao, X. Xu, S. Agathopoulos, L.-J. Yin, C.-M. Wang, and H. T. HintzenHighly stable red-emitting Sr2Si5N8:Eu2+ phosphor with a hydrophobic surfaceJ. Am. Ceram. Soc.20161001257264
  18. 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 fabricationProc. Symposium on Photonics and Optoelectronics (SOPO), IEEE2011
  19. R. Hu, B. Cao, Y. Zou, Y. Zhu, and X. LuoModeling the light extraction efficiency of bi-layer phosphors in white LEDsIEEE Photon. Tech. Lett.20132511411144
  20. 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.2016377898901
  21. Y. Zhu and N. NarendranInvestigation of remote-phosphor white light-emitting diodes with multi-phosphor layersJpn. J. Appl. Phys.201049100203
  22. W. M. Yen and M. J. WeberInorganic phosphors: compositions, preparation and optical propertiesCRC PressWashington, D. C.2004

Other (22)

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.20064534910912

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.2015383297303

N. D. Q. Anh and H. Y. LeeImproving the angular color uniformity and the lumen output for white LED lamps by green Ce0.67 Tb0.33 MgAl11 O19:Ce,Tb. PhosphorJ. Chin. Inst. Eng.201640871875

M. H. CrawfordLEDs for solid-state lighting: performance challenges and recent advancesIEEE J. Sel. Topics Quantum Electron20091510281040

H. Run, L. Xiaobing, F. Han, and L. ShengEffect of phosphor settling on the optical performance of phosphor-converted white light-emitting diodeJ. Lumin.2012132512521256

H. Zheng, X. Luo, R. Hu, B. Cao, X. Fu, Y. Wang, and S. LiuConformal phosphor coating using capillary micro-channel for controlling color deviation of phosphor-converted white light-emitting diodesOpt. Express20122050925098

R. Hu, X. Luo, and S. LiuStudy on the optical properties of conformal coating light-emitting diode by monte carlo simulationIEEE Photon. Technol. Lett.20112316731675

I. ZhmakinEnhancement of light extraction from light emitting diodesPhys. Rep.2011498189241

Z. Y. Liu, S. Liu, K. Wang, and X. B. LuoStudies on optical consistency of white LEDs affected by phosphor thickness and concentration using optical simulationIEEE Trans. Compon. Packag. Tech.201033680687

R. Yu, S. Jin, S. Cen, and P. LiangEffect of the phosphor geometry on the luminous flux of phosphor-converted light-emitting diodesIEEE Photon. Tech. Lett.20102217651767

Z. Y. Liu, C. Li, B. H. Yu, Y. H. Wang, and H. B. NiuEffects of YAG:Ce phosphor particle size on luminous flux and angular color uniformity of phosphor-converted white LEDsJ. Disp. Technol.20128329335

R. Hu, B. Cao, Y. Zou, Y. Zhu, S. Liu, and X. LuoModeling the light extraction efficiency of bi-layer phosphors in white LEDsIEEE Photon. Tech. Lett.20132511411144

V. D. Luong, W. Zhang, and H. LeePreparation of Sr2Si5N8:Eu2+ for white light-emitting diodes by multi-step heat treatmentJ. Alloys Compd.201150975257528

X. Piao, T. Horikawa, H. Hanzawa, and K. MachidaCharacterization and luminescence properties of Sr2Si5N8:Eu2+ phosphor for white light-emitting-diode illuminationAppl. Phys. Lett.200688161908

H. Nersisyan, H. I. Won, and C. W. WonHighly effective synthesis and photoluminescence of Sr2Si5N8:Eu2+ red-emitting phosphor for LEDsChem. Commun.2011474311897

B. Zhang, J.-W. Wang, L.-Y. Hao, X. Xu, S. Agathopoulos, L.-J. Yin, C.-M. Wang, and H. T. HintzenHighly stable red-emitting Sr2Si5N8:Eu2+ phosphor with a hydrophobic surfaceJ. Am. Ceram. Soc.20161001257264

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 fabricationProc. Symposium on Photonics and Optoelectronics (SOPO), IEEE2011

R. Hu, B. Cao, Y. Zou, Y. Zhu, and X. LuoModeling the light extraction efficiency of bi-layer phosphors in white LEDsIEEE Photon. Tech. Lett.20132511411144

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.2016377898901

Y. Zhu and N. NarendranInvestigation of remote-phosphor white light-emitting diodes with multi-phosphor layersJpn. J. Appl. Phys.201049100203

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

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