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论文类型：期刊论文

发表时间：2020-01-15

发表刊物：PHYSICA B-CONDENSED MATTER

收录刊物：EI、SCIE

卷号：577

ISSN号：0921-4526

关键字：GdNbTiO6; Eu3+; Bi3+ red phosphor; Sensitization; Luminescence property; Concentration quenching; Luminescence thermal quenching

摘要：Eu3+ single-doped and Eu3+, Bi3+ co-doped GdNbTiO6 phosphors were synthesized by high temperature solid-state reaction method. The crystal structure of the samples was analyzed by means of X-ray diffraction. Strong red emission at 615 nm with good color purity was observed in GdNbTiO6: Eu3+, Bi3+ system under excitations of a wide region of ultraviolet light. Investigation on Eu3+-concentration dependent luminescence of Eu3+ single-doped samples revealed that exchange interaction between Eu3+ ions was responsible for the concentration quenching of Eu3+. Efficient energy transfers from Bi3+ to Eu3+ have been proved by using the spectra. The introduction of Bi3+ effectively extended the excitation band of Eu3+ in the near-ultraviolet region. However, it almost had no effect on the line shape and peak positions of Eu3+ emission spectra. Luminescence thermal quenching behavior was observed in both Eu3+ single-doped and Eu3+, Bi3+ co-doped GdNbTiO6 phosphors, which can be ascribed to the crossover process.