Citation: Shi-Hui ZHOU, Zhe WANG, Zhan-Hui ZHANG. Influence of charge compensation to the luminescence properties of Ba₂ZnGe₂O₇∶Bi³⁺ phosphor[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(12): 2311-2316. doi: 10.11862/CJIC.2023.194 shu

Influence of charge compensation to the luminescence properties of Ba₂ZnGe₂O₇∶Bi³⁺ phosphor

School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China

Corresponding author: Zhan-Hui ZHANG, zzhlzu@163.com
Received Date: 25 May 2023
Revised Date: 28 October 2023

Figures(6)

In this work, two series of phosphors were prepared using high-temperature solid-state reactions: Ba_2-xZnGe₂O₇∶xBi³⁺ (series Ⅰ) and Ba_1.994-yK_yZnGe₂O₇∶0.006Bi³⁺ (series Ⅱ). X-ray diffraction (XRD) analysis demonstrated that the doping of a small amount of Bi³⁺ and K⁺ did not significantly change the phase structure of the material. The fluorescence spectra of the samples were obtained using a fluorescence spectrometer. The results indicated that the luminescence colors of both series remained yellow-green despite a slight variation in the luminescence spectra with changes in composition. Excitation at 358 nm led to the phosphor exhibiting a broad emission band with its peak at 500 nm, which corresponded to the energy level transition from ³P₁ to ¹S₀. When monitoring at 500 nm, the strongest excitation peak occurred at 358 nm, representing the energy level transition from ¹S₀ to ³P₁. Furthermore, a shoulder peak at 320 nm was observed, indicating a charge transfer band between O^2- and Bi³⁺. Analysis of the spectral data for series Ⅰ suggested that the optimal doping amount of Bi³⁺ was x=0.006. In this matrix, the substitution of Ba²⁺ by Bi³⁺ introduced an unequal substitution, leading to the generation of Ba²⁺ vacancies or interstitial O^2- within the lattice, which had a negative impact on the luminous intensity of the material. Co-doping with K⁺ acted as a charge compensator, effectively cancelling out the Ba²⁺ vacancies or interstitial O^2- by generating interstitial K⁺ or oxygen vacancies. Consequently, this process reduced lattice distortion and improved luminescent intensity. Further analysis of the spectral data for series Ⅱ revealed that the fully charge-compensated phosphor sample exhibited luminescent intensity about 2.5 times higher than that of the sample without K⁺ doping.
- phosphor,
- Ba₂ZnGe₂O₇∶Bi³⁺,
- luminescent properties,
- optical properties
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Influence of charge compensation to the luminescence properties of Ba2ZnGe2O7∶Bi3+ phosphor

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Influence of charge compensation to the luminescence properties of Ba₂ZnGe₂O₇∶Bi³⁺ phosphor