Citation: Shuhao FENG, Feibing XIONG, Yaqing LIN, Han SU, Xu HAN. Preparation and luminescent properties of alkaline metal doped Cd₃Al₂Ge₃O₁₂: Pr³⁺ orange phosphors[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(2): 284-296. doi: 10.11862/CJIC.20250171 shu

Preparation and luminescent properties of alkaline metal doped Cd₃Al₂Ge₃O₁₂: Pr³⁺ orange phosphors

Shuhao FENG ¹ ,
Feibing XIONG ^{1, 2,,} ,
Yaqing LIN ¹ ,
Han SU ¹ ,
Xu HAN ¹

1.
School of Optoelectronics and Communication Engineering, Xiamen University of Technology, Xiamen, Fujian 361024, China
2.
Fujian Key Laboratory of Optoelectronic Technology and Devices, Xiamen University of Technology, Xiamen, Fujian 361024, China

Corresponding author: Feibing XIONG, fbxiong@xmut.edu.cn
Received Date: 24 May 2025
Revised Date: 3 January 2026

Figures(20)

A series of Pr³⁺-doped Cd₃Al₂Ge₃O₁₂ orange phosphors was successfully synthesized using a high- temperature solid-state method, and alkali metal ions (Li⁺, Na⁺, K⁺) for charge compensation. Characterization methods, such as X-ray diffraction (XRD) and fluorescence spectroscopy, were used to study the crystal structure, luminescence properties, and thermal stability of the samples, respectively. The results showed that the doping of Pr³⁺ did not alter the crystal structure of the matrix, and co-doping with alkali metals did not cause phase heterogeneity. Under 450 nm excitation, the main peak of the emission spectrum was located at 613 nm; from the fluorescence emission spectra of Cd_3-xAl₂Ge₃O₁₂: xPr³⁺ (x=0.01-0.09) with different doping concentrations, it was found that the optimal doping concentration of Pr³⁺ was 0.03. The strategy of co-doping with alkali metal ions effectively improves the luminescent performance of the materials. Among them, the fluorescence intensity and lifetime of the Li⁺, Na⁺, and K⁺ co-doped phosphor series were significantly enhanced, surpassing the undoped samples. The enhancement effect of different alkali metal ion dopings follows the order of Li⁺, Na⁺, and K⁺, with the Li⁺ co-doped sample exhibiting the best luminescence intensity, which was 1.58 times that of the undoped system. Additionally, the thermal stability after charge compensation was investigated at 393 K, where the luminous intensity of the Li-compensated Cd_2.94Al₂Ge₃O₁₂: 0.03Pr³⁺, 0.03Li⁺ sample was 72.70% of that at 293 K. The CIE color coordinates confirmed that the emission of this phosphor was located in the orange region. Furthermore, the optimal sample was used to fabricate a white light-emitting diode, with CIE color coordinates of (0.368 2, 0.300 1), which lies within the white light circle.
- Cd₃Al₂Ge₃O₁₂,
- charge compensation,
- orange phosphor,
- white light-emitting diode
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Preparation and luminescent properties of alkaline metal doped Cd₃Al₂Ge₃O₁₂: Pr³⁺ orange phosphors