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Self‐reduction process and enhanced blue emission in SrAl 2 Si 2 O 8 : Eu, Tb via electron transfer from Tb 3+ to Eu 3+
Author(s) -
Xu Hongwei,
Wang Lili,
Li Minhong,
Ran Weiguang,
Deng Zhihan,
Houzong Ruizhi,
Shi Jinsheng
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700013
Subject(s) - luminescence , doping , materials science , analytical chemistry (journal) , excited state , emission spectrum , photoluminescence , spectral line , chemistry , optoelectronics , atomic physics , physics , chromatography , astronomy
Eu, Tb co‐doped SrAl 2 Si 2 O 8 luminescent materials were synthesized via a high‐temperature solid‐state reaction. Excitation spectra of SrAl 2 Si 2 O 8 : Eu 2+ gives two broad excitation bands maximizing at 270 and 330 nm, resulting from splitting Eu 2+ energy levels in octahedral crystal field. Eu single doped SrAl 2 Si 2 O 8 luminescent material exhibits two emission bands at about 406 and 616 nm. Intensity of the blue emission from Eu 2+ is always strong, compared with that of the red emission band of Eu 3+ . Reduction from Eu 3+ to Eu 2+ can be explained with the model of charge compensation. Blue emission in SrAl 2 Si 2 O 8 : x Eu was strengthened after incorporation of Tb, which can be explained by electron transfer from Tb 3+ to Eu 3+( T b 3 + + E u 3 + → T b 4 + + E u 2 + ) . Under 230 nm excitation, intensity of Tb 3+ emission was nearly unchanged and that of Eu 2+ was increased, obviously due to the delivery of more electrons to Eu 3+ . The strongest emission of Eu 2+ in 0.09Eu/0.06Tb co‐doped SrAl 2 Si 2 O 8 and excited at 270 and 330 nm was remarkably enhanced by about four times compared to that of 0.15Eu Single doped SrAl 2 Si 2 O 8 . All of the results indicate that SrAl 2 Si 2 O 8 : x Eu, y Tb are potential blue emitting luminescent materials for UV‐LEDs. More importantly, this research may provide a new perspective in designing broad band blue luminescent materials.