Synthesis and luminescence properties of Tb3+/Eu3+ co-doped GdAlO3 phosphors with enhanced red emission
来源期刊:JOURNAL OF RARE EARTHS2018年第9期
论文作者:Shihua Liu Jinkai Li Wenzhi Wang
文章页码:924 - 930
摘 要:The(Gd0.97-xEuxTb0.03)AIO3(x= 0.005-0.07) phosphors were synthesized by the co-precipitation method,using ammonium bicarbonate as a precipitant.The combined technologies of FT-IR,XRD,FESEM,PLE/PL and photo luminescence decay analysis were used to study the phase evolution,morphologies and luminescent properties.The phosphors with good dispersion exhibit strong vivid red emission located at 617 nm(5 D0-7 F2 transition of Eu3+) under the optimal excitation wavelength of 275 nm(4 f8-4 f75 d1 transition of Tb3+,8 S7/2→6IJ transition of Gd3+).The presence of Gd3+ and Tb3+ excitation bands on the PLE spectra monitoring the Eu3+ emission directly gives an evidence of Tb3+ → Eu3+ and Gd3+ → Eu3+ energy transfer,The emission intensity varies with the Eu3+ amount,and the quenching concentration is ~5 at% which is close to the calculated value.The quenching mechanism is determined to be the exchange reaction between Eu3+.The temperature-dependent PL analysis indicates that the best(Gd0.92Eu0.05Tb0.03)AlO3 sample possesses good thermally stable properties.All the(Gd0.97-xEuxTb0.03)AIO3 phosphors in this work have similar CIE chromaticity coordinates and color temperatures,which are(0.65 ± 0.02,0.35 ± 0.02) and ~2558 K,respectively.Fluorescence decay analysis shows that the lifetime for~617 nm emission decreases with the content of Eu3+ and temperature increasing.Owing to the Tb3+→ Eu3+ energy transfer,the luminescent properties of the(Gd0.92Eu0.05Tb0.03)AlO3 phosphors are superior to the single Eu3+ doped sample(Gd0.95Eu0.05)AlO3.As a result,the prepared phosphors may be widely used in solid-state display and light emitting devices.
Qi Chen,Jinkai Li,Wenzhi Wang
School of Materials Science and Engineering,University of Jinan
摘 要:The(Gd0.97-xEuxTb0.03)AIO3(x= 0.005-0.07) phosphors were synthesized by the co-precipitation method,using ammonium bicarbonate as a precipitant.The combined technologies of FT-IR,XRD,FESEM,PLE/PL and photo luminescence decay analysis were used to study the phase evolution,morphologies and luminescent properties.The phosphors with good dispersion exhibit strong vivid red emission located at 617 nm(5 D0-7 F2 transition of Eu3+) under the optimal excitation wavelength of 275 nm(4 f8-4 f75 d1 transition of Tb3+,8 S7/2→6IJ transition of Gd3+).The presence of Gd3+ and Tb3+ excitation bands on the PLE spectra monitoring the Eu3+ emission directly gives an evidence of Tb3+ → Eu3+ and Gd3+ → Eu3+ energy transfer,The emission intensity varies with the Eu3+ amount,and the quenching concentration is ~5 at% which is close to the calculated value.The quenching mechanism is determined to be the exchange reaction between Eu3+.The temperature-dependent PL analysis indicates that the best(Gd0.92Eu0.05Tb0.03)AlO3 sample possesses good thermally stable properties.All the(Gd0.97-xEuxTb0.03)AIO3 phosphors in this work have similar CIE chromaticity coordinates and color temperatures,which are(0.65 ± 0.02,0.35 ± 0.02) and ~2558 K,respectively.Fluorescence decay analysis shows that the lifetime for~617 nm emission decreases with the content of Eu3+ and temperature increasing.Owing to the Tb3+→ Eu3+ energy transfer,the luminescent properties of the(Gd0.92Eu0.05Tb0.03)AlO3 phosphors are superior to the single Eu3+ doped sample(Gd0.95Eu0.05)AlO3.As a result,the prepared phosphors may be widely used in solid-state display and light emitting devices.
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