Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 21, pp 18476–18485 | Cite as

Effect of phosphor composition and packaging structure of flexible phosphor films on performance of white LEDs

  • Yiming Liu
  • Jun ZouEmail author
  • Mingming Shi
  • Yang LiEmail author
  • Bobo Yang
  • Ziming Wang
  • Wenbo Li
  • Fei Zheng
  • Heyu Zhou
  • Nan Jiang


YAG:Ce3+ phosphor and CASN:Eu2+ phosphor were synthesized by conventional solid-state reaction, and the phosphor films were prepared from the synthesized YAG:Ce3+ phosphor and CASN:Eu2+ phosphor by a simple spin coating method. The influence on the concentration of the red phosphor and the different packaging structure of the phosphor films on the optical and electrical properties of white LEDs were investigated. The red and green phosphor were coated layer by layer to investigate the spectral absorption effect of phosphors in the films. The phosphor film placing green phosphor adjacent to the chips is named as G–R structure, likewise, the red phosphor close to the chips is labeled as R–G structure. The results show that the emission spectra of the phosphor films with G–R structure exhibit obvious red shift with the increase of the proportions of red phosphor due to the red phosphor have a reabsorption effect on the green light. Then, the phosphor films with G–R and R–G structures were packaged on the LED respectively, and the light efficiency and the correlated color temperature (CCT) of the LEDs gradually decrease with the increase of the proportions of red phosphor. The luminous efficacy of LEDs packaged by G–R structured phosphor film is higher than that of LEDs packaged by R–G structured phosphor film. The luminous efficiency of LEDs packaged by G–R structured phosphor film can reach 128.95 lm/W, the CCT is 4458 K, and the CRI is 65.1. Moreover, the CCT uniformity of LEDs packaged by G–R structured phosphor film is superior to that of LEDs packaged by R–G structured phosphor film. Therefore, the G–R structured phosphor film has potential application values for improving the luminous efficiency and light uniformity of the device.



This work was supported by the Science and Technology Planning Project of Zhejiang Province, China (2018C01046), Enterprise-funded Latitudinal Research Projects (J2016-141), (J2017-171), (J2017-293), (J2017-243), Sponsored by Shanghai Sailing Program (18YF1422500), Research start-up project of Shanghai Institute of Technology (YJ2018-9).


  1. 1.
    G.H. Li, J.J. Chen, Z.Y. Mao, W.W. Song, T. Sun, D.J. Wang, Atmospheric pressure preparation of red-emitting CaAlSiN3:Eu2+ phosphors with variable fluxes and their photoluminescence properties. Ceram. Int. 42, 1756–1761 (2016)CrossRefGoogle Scholar
  2. 2.
    Y.M. Liu, J. Zou, M.M. Shi, B.B. Yang, Y. Han, W.B. Li, Z.M. Wang, H.Y. Zhou, M.T. Li, N. Jiang, Effect of gallium ion content on thermal stability and reliability of YAG: Ce phosphor films for white LEDs. Ceram. Int. 44, 1091–1098 (2018)CrossRefGoogle Scholar
  3. 3.
    X.J. Xu, L. Hong, Z. Yong, R.X. Li, P.J. Tian, D.H. Xiong, M.X. Chen, Tunable chromaticity and enhanced luminous efficacy of white LEDs with phosphor-in-glass coating via multilayer screen-printing. Ceram. Int. 43, 13569–13575 (2017)CrossRefGoogle Scholar
  4. 4.
    H.Y. Zhou, J. Zou, Y. Li, W.J. Wu, M.M. Shi, B.B. Yang, Z.M. Wang, Effect of annealing in hydrogen atmosphere on the photoluminescence properties of phosphor-in- glass in tellurate glass. J. Non-Cryst. Solids 475, 179–183 (2017)CrossRefGoogle Scholar
  5. 5.
    Y.M. Liu, J. Zou, B.B. Yang, W.B. Li, M.M. Shi, Y. Han, Z.M. Wang, N. Jiang, Preparation and reliability of flexible phosphor film for warm white LED. Mater. Technol. 33, 22–28 (2017)CrossRefGoogle Scholar
  6. 6.
    J.J. Yang, T. Wang, D.C. Chen, G.D. Chen, Q.L. Liu, An investigation of Eu2+-doped CaAlSiN3 fabricated by an alloy-nitridation method. Mater. Sci. Eng. B 177, 1596–1604 (2012)CrossRefGoogle Scholar
  7. 7.
    C.W. Sher, K.J. Chen, C.C. Lin, H.V. Han, H.Y. Lin, Z.Y. Tu, H.H. Tu, K. Honjo, H.Y. Jiang, S.L. Ou, R.H. Horng, X.L. Li, C.C. Fu, H.C. Kuo, Large-area, uniform white light LED source on a flexible substrate. Opt. Express 23, A1167 (2015)CrossRefGoogle Scholar
  8. 8.
    S. Ye, F. Xiao, Y.X. Pan, Y.Y. Ma, Q. Y. Zhang. Phosphors in phosphor-converted white light-emitting diodes: Recent advances in materials, techniques and properties. Mater. Sci. Eng. Rep. 71, 1–34 (2010)CrossRefGoogle Scholar
  9. 9.
    B. Xie, W. Chen, J.J. Hao, D. Wu, X.J. Yu, Y.H. Chen, R. Hu, K. Wang, X.B. Luo, Structural optimization for remote white light-emitting diodes with quantum dots and phosphor: packaging sequence matters. Opt. Express 24, A1560 (2016)CrossRefGoogle Scholar
  10. 10.
    J. Jia, A.Q. Zhang, D.X. Li, X.G. Liu, B.S. Xu, H. S. Jia. Preparation and properties of the flexible remote phosphor film for blue chip-based white LED. Mater. Des. 102, 8–13 (2016)CrossRefGoogle Scholar
  11. 11.
    N. Narendran, Y. Gu, J.P. Freyssinier-Nova, Y. Zhu, Extracting phosphor-scattered photons to improve white LED efficiency. Phys. Status Solidi 202, R60–R62 (2005)CrossRefGoogle Scholar
  12. 12.
    A. Revaux, G. Dantelle, D. Decanini, D. Decanini, A.M. Haghiri-Gosnet, T. Gacoin, J.P. Boilot, Synthesis of YAG: Ce/TiO2 nanocomposite films. Opt. Mater. 33, 1124–1127 (2011)CrossRefGoogle Scholar
  13. 13.
    Y.G. Li, M.A. Rui, Preparation and optical properties of sol–gel derived thick YAG:Ce phosphor film. Opt. Mater. 34, 1148–1154 (2012)CrossRefGoogle Scholar
  14. 14.
    R. Hu, X.B. Luo, H. Zheng, Hotspot location shift in the high-power phosphor-converted white light-emitting diode packages. Jpn. J. Appl. Phys. 51, 994–1000 (2012)CrossRefGoogle Scholar
  15. 15.
    X.B. Luo, X. Fu, F. Chen, H. Zheng, Phosphor self-heating in phosphor converted light emitting diode packaging. Int. J. Heat Mass Transf. 58, 276–281 (2013)CrossRefGoogle Scholar
  16. 16.
    H.S. Kim, K. Machida, T. Horikawa, H. Hanzawa, Luminescence properties of CaAlSiN3: Eu2+ phosphor prepared by direct-nitriding method using fine metal hydride powders. J. Alloys Compd. 633, 97–103 (2015)CrossRefGoogle Scholar
  17. 17.
    J.S. Zhong, H.B. Gao, Y.J. Yuan, L.F. Chen, D.Q. Chen, Z.G. Ji, Eu3+ - doped double perovskite-based phosphor-in-glass color converter for high-power warm w-LEDs. J. Alloys Compd. 735, 2303–2310 (2018)CrossRefGoogle Scholar
  18. 18.
    J.J. Chen, Y. Zhao, G.H. Li, Z.Y. Mao, D.J. Wang, L.J. Bie, Facile synthesis of yellow-emitting CaAlSiN3: Ce3+ phosphors and the enhancement of red-component by co-doping Eu2+ ions. Solid State Commun. 255–256, 1–4 (2017)CrossRefGoogle Scholar
  19. 19.
    Z.Q. Hu, Z.Y. Cheng, P.P. Dong, H. Zhang, Y.J. Zhang, Enhanced photoluminescence property of single-component CaAlSiN3: Ce3+, Eu2+ multicolor phosphor through Ce3+-Eu2+ energy transfer. J. Alloys Compd. 727, 633–641 (2017)CrossRefGoogle Scholar
  20. 20.
    G.H. Li, Y. Zhao, J. Xu, Z.Y. Mao, J.J. Chen, D.J. Wang, Effective suppression of AlN impurity in synthesis of CaAlSiN3: Eu2+ phosphors under condition of atmospheric pressure. Mater. Chem. Phys. 201, 1–6 (2017)CrossRefGoogle Scholar
  21. 21.
    Y.B. Wei, Z. Wu, Y.M. Jia, J. Wu, Y.C. Shen, H.S. Luo, Dual-enhancement of ferro-/piezoelectric and photoluminescent performance in Pr3+ doped (K0.5Na0.5)NbO3 lead-free ceramics. Appl. Phys. Lett. 105, 042902–042902-4 (2014). CrossRefGoogle Scholar
  22. 22.
    J. Wu, W.J. Mao, Z. Wu, Y.J. Wang, Y.M. Jia. Piezoelectric Er3+-doped (Ba1 – xCax)(Sn0.06Ti0.94)O3 ceramic: photoluminescence sensitive to morphotropic phase boundary. J. Alloys Compd. 684, 342–345 (2016)CrossRefGoogle Scholar
  23. 23.
    J. Wu, W.J. Mao, Z. Wu, Y.M. Jia, The photoluminescence indicating the Curie transition of Er3+-doped (Ba0.97Ca0.03)(Sn0.06Ti0.94)O3 ferroelectric ceramic. Mater. Lett. 166, 75–77 (2016)CrossRefGoogle Scholar
  24. 24.
    Y. Peng, R.X. Li, H. Cheng, Z. Chen, H. Li, M.X. Chen, Facile preparation of patterned phosphor-in-glass with excellent luminous properties through screen-printing for high-power white light-emitting diodes. J. Alloys Compd. 693, 279–284 (2017)CrossRefGoogle Scholar
  25. 25.
    C.H. Chiang, H.Y. Tsai, T.S. Zhan, H.Y. Lin, Y.C. Fang, S.Y. Chu, Effects of phosphor distribution and step-index remote configuration on the performance of white light-emitting diodes. Opt. Lett. 40, 2830–2833 (2015)CrossRefGoogle Scholar
  26. 26.
    Y. Peng, S. Wang, R. Li, H. Li, H. Cheng, M. Chen, S. Liu, Luminous efficacy enhancement of ultraviolet-excited white light-emitting diodes through multilayered phosphor-in-glass. Appl. Opt. 55, 4933–4938 (2016)CrossRefGoogle Scholar
  27. 27.
    R. Xiang, X.J. Liang, Q.Y. Xi, Z.F. Yuan, C.R. Chen, W.D. Xiang, A chromaticity-tunable white LED by screen-printing red phosphor coating on PiG plates. Ceram. Int. 42, 19285–19291 (2016)Google Scholar
  28. 28.
    Z.B. Lin, H. Lin, J. Xu, F. Huang, H. Chen, B. Wang, Y.S. Wang, Highly thermal-stable warm w-LED based on Ce:YAG PiG stacked with a red phosphor layer. J. Alloys Compd. 649, 661–665 (2015)CrossRefGoogle Scholar
  29. 29.
    J.S. Lee, P. Arunkumar, S. Kim, I.J. Lee, H. Lee, W.B. Im, Smart design to resolve spectral overlapping of phosphor-in-glass for high-powered remote-type white light-emitting devices. Opt. Lett. 39, 762–765 (2014)CrossRefGoogle Scholar
  30. 30.
    S.P. Ying, H.Y. Chien, Effect of reassembled remote phosphor geometry on the luminous efficiency and spectra of white light-emitting diodes with excellent color rendering property. IEEE Trans. Electron Dev. 63, 1117–1121 (2016)CrossRefGoogle Scholar
  31. 31.
    E. Kim, S. Unithrattil, I.S. Sohn, S.J. Kim, W.J. Chung, W.B. Im, Facile one-step fabrication of 2-layered and 4-quadrant type phosphor-in-glass plates for white LEDs: an insight into angle dependent luminescence. Opt. Mater. Express 6, 804–814 (2016)CrossRefGoogle Scholar
  32. 32.
    P.X. Qing, K.I. Machida, T. Horikawa, H. Hanzawa, Synthesis and luminescent properties of low oxygen contained Eu2+-doped Ca-α-SiAlON phosphor from calcium cyanamide reduction. J. Rare Earths 26, 198–202 (2008)CrossRefGoogle Scholar
  33. 33.
    Z.M. Wang, J. Zou, C.Y. Zhang, M.M. Shi, B.B. Yang, Y. Li, H.Y. Zhou, Y.M. Liu, M.T. Li, X.L. Qian, High color rendering index of warm WLED based on LuAG: Ce3+ PIG coated CaAlSiN3: Eu2+ phosphor film for residential lighting applications. J. Mater. Sci. Mater. Electron. 29, 8767–8773 (2018)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Yiming Liu
    • 1
  • Jun Zou
    • 2
    Email author
  • Mingming Shi
    • 2
  • Yang Li
    • 1
    Email author
  • Bobo Yang
    • 2
  • Ziming Wang
    • 1
  • Wenbo Li
    • 3
  • Fei Zheng
    • 2
  • Heyu Zhou
    • 1
  • Nan Jiang
    • 1
  1. 1.School of Material Science and EngineeringShanghai Institute of TechnologyShanghaiChina
  2. 2.School of ScienceShanghai Institute of TechnologyShanghaiChina
  3. 3.Zhejiang Emitting Optoelectronic Technology Co, LtdJiaxingChina

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