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A chemical co-precipitation strategy was employed to synthesize a series of (Gd0.95−xLuxEu0.05)3Al5O12 (x =0.1−0.95) powder phosphors, followed by vacuum sintering to achieve transparent garnet ceramic phosphors. The density functional theory indicated Lu3Al5O12 was formed in priority compared with Gd3Al5O12 during solid-phase reaction. Upon high-temperature sintering, the Lu3+ substitution for Gd3+ suppressed point mass diffusion leading to a smaller grain size. The in-line transmittances of bulk specimens with x = 0.1, 0.3, 0.5, 0.7, and 0.95 nm were ~83.5%, 80.1%, 68.8%, 73.7%, and 82.2% at 710 nm (Eu3+ emission center), respectively, among which the sample of x = 0.1 exhibited the optical grade with near-zero optical loss in agreement with the defect-free single crystal (~100% of the theoretical transmittance). The
resulting particle and ceramic materials both presented characteristic Eu3+ emission arising from 5D0→7FJ (J = 1−4) transition, where the dominant far-red emission at ~710 nm arising from 5D0→7F4 transition overlapped with the absorption of phytochrome (PFR). The photoluminescence excitation and photoluminescence intensities of (Gd0.95−xLuxEu0.05)3Al5O12 powders and ceramics generally increased at a higher Gd3+/Lu3+ ratio. Lu3+ dopants delayed the fluorescence lifetime while the bulk samples had shorter lifetime compared to the particle counterparts. The transparent (Gd0.85Lu0.1Eu0.05)3Al5O12
ceramic phosphor exhibited good thermal stability with a high thermal quenching temperature above 533 K. The designed ceramic phosphor-converted light-emitting diode had a saturation injection current of 435 mA and a current-dependent color rendering index. More importantly, our report marked the developmental stage of transparent ceramic materials towards zero optical loss.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Garnet ceramics, Optical property , Microstructure evolution, Crystal structure, Sintering

刊行年月日: 2023-12-25

出版者: Tsinghua University Press

掲載誌:

• Journal of Advanced Ceramics (ISSN: 22264108) vol. 13 issue. 1 p. 113-123

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4602

公開URL: https://doi.org/10.26599/JAC.2024.9220845

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更新時刻: 2024-07-23 16:30:20 +0900

MDRでの公開時刻: 2024-07-23 16:30:20 +0900