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• 作者：Xinguo Zhang ; Liya Zhou ; Qi Pang ; Jianxin Shi ; Menglian Gong
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 10, 2014
• 年：2014
• 卷：118
• 期：14
• 页码：7591-7598
• 全文大小：613K
• 年卷期：v.118,no.14(April 10, 2014)
• ISSN：1932-7455

文摘

The Ce³⁺ 鈫?Tb³⁺ 鈫?Eu³⁺ energy-transfer process enables Eu³⁺⁵D₀ 鈫?⁷F_J line emission to be sensitized by the allowed Ce³⁺ 4f¹ 鈫?5d¹ absorption transition in near-ultraviolet (NUV) and violet spectral regions. This energy-transfer strategy is applied in Y₂SiO₅:Ce³⁺, Tb³⁺, Eu³⁺ powders, leading to line-emitting red phosphors that can be excited by short-wavelength InGaN LEDs. The blue, green, and red colors can be tuned by the ratio of Ce³⁺/Tb³⁺/Eu³⁺. Furthermore, the energy-transfer efficiencies and corresponding mechanisms are discussed in detail, and the thermal stability is evaluated. The results suggest that the optimal composition phosphor Y₂SiO₅: 0.01Ce³⁺, 0.50Tb³⁺, 0.01Eu³⁺, which exhibits an intense Eu³⁺ red 4f鈥?f sharp emission with a strong 4f鈥?d absorption band of Ce³⁺ at the NUV region, could serve as a potential broadband-excited and narrow line red phosphor for NUV LEDs.