Abstract
Abstract 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.
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