A Tunable-Color Emission Phosphor Y2O3:Eu3+, Bi3+ with Efficient Energy Transfer for White Light Emitting Diodes
The Eu3+, Bi3+ ions co-doped Y2O3 phosphor has been synthesized by the conventional solid-state reaction method, and its photoluminescence (PL) spectra are investigated for application in white light emitting diode (LED). The Eu3+, Bi3+ ions co-doped Y2O3 phosphor showed a characteristic emissions with greenish blue and red color upon the near-UV light in the range of 310–360 nm, originating from 3P1 → 1S0 transition of Bi3+ and 5D0 → 7F J transition of Eu3+, respectively. As 613-nm emission of Eu3+ ions is monitored, excitation spectrum consists of two broad peaks near 230 nm and 330 nm, ascribed to the Eu3+-O2− charge transfer band (CTB) and the transition from the ground state to the excited states of Bi3+ ions, respectively. It implies that the energy transfer from Bi3+ ions to Eu3+ ions occur and the phosphor’s color may be controlled by adjusting the concentrations of Eu3+ ions and Bi3+ ions in Y2O3. The availability of this strategy is demonstrated in this work, and white light can be realized with superior chromaticity coordinates of (x = 0.337, y =0.328) and a CCT of 5284 K for Y2O3:4% Eu3+, 0.1%Bi3+. Thus, it will be a promising candidate for the ultraviolet excitation white light emitting diode (LED).
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Document Type: Research Article
Publication date: January 1, 2016
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