Sol-gel auto-combustion preparation and photoluminescence properties of Er3+-doped K2La2Ti3O10 phosphors with superior thermal luminescence stability
2019
Li, Xiangping | Tian, Yu | Shen, Rensheng | Li, Xuejing | Xu, Sai | Cheng, Lihong | Sun, Jiashi | Zhang, Jinsu | Zhang, Xizhen | Chen, Baojiu
Thermal luminescence property is one of the important factors to evaluate the performance of the phosphors. In this work, a series of Er³⁺-doped K₂La₂Ti₃O₁₀ phosphors were synthesized by a sol-gel auto-combustion method. The crystal structure, surface morphology, luminescence performance, thermal stability, and temperature sensing properties were investigated in detail. All samples exhibited green emissions around 530 and 564 nm due to the ²H₁₁/₂, ⁴S₃/₂→⁴I₁₅/₂ transitions of Er³⁺ upon 383 nm excitation. The optimal doping concentration of Er³⁺ was about 3 mol%. Electric dipole-dipole interaction was determined to be the main mechanism for the concentration quenching of Er³⁺ and possible cross-relaxation routes were proposed. Thermal luminescence quenching behavior was observed from the temperature-dependent emission spectra, and the results showed that K₂La₂Ti₃O₁₀: Er³⁺ phosphors had superior thermal luminescence stability. The activation energy was determined to be about 0.188 eV. Moreover, it was found that the temperature sensitivity of Er³⁺ in K₂La₂Ti₃O₁₀: Er³⁺ phosphors was sensitive to the doping concentration of Er³⁺. The lower the concentration of Er³⁺ was, the higher the temperature sensitivity was.
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