摘要
A series of luminescent Ba0.79Al10.9O17.14∶xEu (x=0.005-0.12) phosphors were prepared by high-temperature solid-state reaction in air atmosphere.The coexistence of Eu2+ and Eu3+ was observed and verified by photoluminescence (PL) and photoluminescence excitation (PLE) spectra,X-ray photoelectron spectra (XPS),and diffuse reflection spectra.The band emission peaking at 430 nm was assigned to 4F65D-4F7 transition of Eu2+,and another four emissions peaking at 589,619,655,and 704 nm were attributed to 4F-4F transitions of 5D0-7FJ(J=1,2,3,4) of Eu3+.The related mechanism of self-reduction was discussed in detail.The color of the Ba0.79Al10.9O17.14∶xEu phosphors could be shifted from blue (0.23,0.10) to red (0.42,0.27) by doping Li+ ions,and the temperature dependence properties were investigated.
基金
We thank the National Natural Science Foundation of China，the Program for New Century Excellent Talents in University of Ministry of Education of China，the Fundamental Research Funds for Central Universities
