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Synthesis, Persistent Luminescence, and Thermoluminescence Properties of Yellow Sr 3 SiO 5 :Eu 2+ ,RE 3+ (RE=Ce, Nd, Dy, Ho, Er, Tm, Yb) and Orange‐Red Sr 3− x Ba x SiO 5 :Eu 2+ , Dy 3+ Phosphor
Author(s) -
Li Ye,
Li Baohong,
Ni Chenchen,
Yuan Shuxia,
Wang Jing,
Tang Qiang,
Su Qiang
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201301045
Subject(s) - thermoluminescence , phosphor , luminescence , photoluminescence , materials science , analytical chemistry (journal) , dopant , persistent luminescence , ion , emission spectrum , mineralogy , doping , chemistry , spectral line , optoelectronics , physics , organic chemistry , chromatography , astronomy
Sunlight‐excitable orange or red persistent oxide phosphors with excellent performance are still in great need. Herein, an intense orange‐red Sr 3− x Ba x SiO 5 :Eu 2+ ,Dy 3+ persistent luminescence phosphor was successfully developed by a two‐step design strategy. The XRD patterns, photoluminescence excitation and emission spectra, and the thermoluminescence spectra were investigated in detail. By adding non‐equivalent trivalent rare earth co‐dopants to introduce foreign trapping centers, the persistent luminescence performance of Eu 2+ in Sr 3 SiO 5 was significantly modified. The yellow persistent emission intensity of Eu 2+ was greatly enhanced by a factor of 4.5 in Sr 3 SiO 5 :Eu 2+ ,Nd 3+ compared with the previously reported Sr 3 SiO 5 :Eu 2+ , Dy 3+ . Furthermore, Sr ions were replaced with equivalent Ba to give Sr 3− x Ba x SiO 5 :Eu 2+ ,Dy 3+ phosphor, which shows yellow‐to‐orange‐red tunable persistent emissions from λ =570 to 591 nm as x is increased from 0 to 0.6. Additionally, the persistent emission intensity of Eu 2+ is significantly improved by a factor of 2.7 in Sr 3− x Ba x SiO 5 :Eu 2+ ,Dy 3+ ( x =0.2) compared with Sr 3 SiO 5 :Eu 2+ ,Dy 3+ . A possible mechanism for enhanced and tunable persistent luminescence behavior of Eu 2+ in Sr 3− x Ba x SiO 5 :Eu 2+ ,RE 3+ (RE=rare earth) is also proposed and discussed.