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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING · 2023 · IF 4.1

A novel co-substitution strategy to enhance the luminescence performance of Zn2TiO4:Cr3+ phosphor

Kang Cheng,Xinyue Liu,Weichao Huang,Xinyong Gong,Chaoyong Deng

Cr 3+ is an ideal activator for near-infrared phosphor. Cr 3+ ions have an electronic structure in which the outermost shell is not fully filled, which makes the emission of Cr 3+ susceptible to the crystal field environment and the change of local structural. Therefore, when Zn 2+ -Ti 4+ ion pairs are replaced with Al 3+ -Al 3+ /Ga 3+ -Ga 3+ ion pairs , changes in the crystal structure and the crystal field are strengthened, which improves the luminescence performances of Zn 2 TiO 4 :Cr 3+ phosphors. The thermal stability and the intensity of the luminescence can be clearly seen to have increased.

研究领域: 材料科学 · 无机化学 · 发光材料 · 固体物理 · 功能材料

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MATERIALS RESEARCH BULLETIN · 2023 · IF 5.4

Improved luminescence of CaAl12-xGaxO19:Cr3+ near-infrared phosphor based on Sr2+ and Ga3+ substitution

Yu Zhang,Kai Li,Xuelian Zhou,Kaixuan Wang,Ze Wang,Sur Lig,Kefu Chao,Fengqi Zhao

Cr 3+ -doped near-infrared phosphors have recently attracted a wide attention. Here, NIR Ca 1- y Sr y Al 12- x Ga x O 19 :0.12Cr 3+ phosphors are obtained by a high-temperature solid-phase method. First, a series of CaAl 7.88 Ga 4 O 19 :0.12Cr 3+ samples is studied and shows that the crystal field strength can be tuned by cation substitutions, until achieving a sharp emission at 692 nm and a broad emission at 780 nm under a 400 nm excitation, and an internal quantum yield of 90.73%. A further substitution by an appropriate amount of Sr 2+ is suggested to be beneficial to increase the rigidity of the crystal structure by Debye temperature calculations. Experimentally, it is observed that Sr 2+ for Ca 2+ substitutions did not affect the luminescence wavelength and resulted in a significant increase of the thermal stability. When 0.7 Sr 2+ substitute Ca 2+ , the thermal stability at 450 K increased by 28% compared to the samples without Sr 2+ .

研究领域: 材料科学 · 无机化学 · 固体物理 · 光学材料 · 功能材料

✓ 已验证 DOI 高影响因子

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A novel co-substitution strategy to enhance the luminescence performance of Zn2TiO4:Cr3+ phosphor

Improved luminescence of CaAl12-xGaxO19:Cr3+ near-infrared phosphor based on Sr2+ and Ga3+ substitution