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

  • 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: Ba2-xZnGe2O7xBi3+ (series Ⅰ) and Ba1.994-yKyZnGe2O7∶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 O2- 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 O2- 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 O2- 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.
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