科研之友
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摘要
A series of Eu2+-activated green-emitting phosphors, barium zinc silicate Ba2Zn3Si3O11:Eu2+, was first synthesized by chemical sol-gel method. The photoluminescence excitation and emission spectra, the concentration quenching of the phosphors, the luminescence color chromaticity and absolute quantum efficiency (QE), were measured. The results indicate that Ba2Zn3Si3O11:Eu2+ phosphors can be efficiently excited by not only UV- but also blue-LED chips to realize novel green-emitting luminescence corresponding to the electric-dipole allowed 4f-5d transition of the Eu2+ ions. Additionally, the luminescence was suggested to originate from two kinds of Eu2+ centers in terms of photoluminescence properties. The energy transfer between the Eu2+ centers was discussed by analyzing the photoluminescence spectra, concentration-dependent luminescence intensity and lifetimes. This is a potential candidate for the application to white LEDs because the tunable luminescence and small thermal quenching.
- 出版日期2013-5-15
- 单位苏州大学
