Abstract
White-light emission is generated by combining blue and blue green to yellow emissions of and , respectively, in a single host lattice of . The excitation is in the near-UV region . The role of concentration of on the photoluminescence emission intensity in [, 0.005, 0.0075, and 0.01] is studied, and it is found that the critical concentration is . Energy migration over sites occurs, resulting in concentration quenching. exhibits a high absorption in the near-UV region. Energy transfer from to occurs in , . Optimization of concentration of to produce white light in shows that the optimum concentrations of and are 0.01 and , respectively. Partial energy transfer from to is responsible for the white-light generation. The results reveal that , is an efficient “single host lattice phosphor” for solid-state lighting technology using UV light-emitting diode (LED) to generate white light.
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