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Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

Abstract

Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.

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Acknowledgements

The authors acknowledge the generous financial support from the National Natural Science Foundation of China (61975070, 51902143, 61971207, and 61775088), Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Key Research and Development Project of Jiangsu Province (BE2018062, BE2019033), Natural Science foundation of Jiangsu Province (BK20191467), Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX20_2336), International S&T Cooperation Program of Jiangsu Province (BZ2019063, BZ2020045, and BZ2020030), Natural Science Foundation of the Jiangsu Higher Education Institutes of China (19KJB430018, 20KJA430003), Special Project for Technology Innovation of Xuzhou City (KC19250, KC20201, and KC20244), and Open Project of State Key Laboratory of Advanced Materials and Electronic Components (FHR-JS-202011017).

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Correspondence to Le Zhang or Hao Chen.

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Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

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Zhou, T., Hou, C., Zhang, L. et al. Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs. J Adv Ceram (2021). https://doi.org/10.1007/s40145-021-0496-8

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Keywords

  • Ce,Cr:LuAG TC
  • spectral regulation
  • energy transfer
  • color rendering index (CRI)
  • white LEDs/LDs