The Properties of a Novel Green Long Afterglow Phosphor Zn₂GeO₄:Mn²⁺_0.01, Pr³⁺_0.01

Abstract:

The sunlight-excited red long afterglow phosphor ZnGa₂O₄:Cr³⁺ was prepared by the high-temperature solid state reaction. The emission lines around 690nm all originated from ²E→⁴A₂ of Cr³⁺ ions. The long-lasting phosphorescence (LLP) spectra indicated optimal long-lasting luminescence could obtain from ultraviolet (UV) light excitation. The thermoluminescence (TL) curve implied different depth of trap was caused by the dopant ions. The initial persistent luminescence was caused by the recombination between the captured electrons and Cr³⁺ ions, and this recombination process was accomplished through the conduction band. The linear dependence of the long afterglow intensity versus time in the decay curve maybe implied a new recombination mechanism.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 552-561
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.552
• Online since: June 2014
• Authors: Min Hua Wan, Yin Hai Wang*, Xian Sheng Wang, Hui Zhao, Zheng Fa Hu, Cheng Wang
• Keywords: Afterglow, Mn²⁺, Trap, Zn₂GeO₄

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