Abstract
A series of near-ultraviolet-excitable emission-tunable phosphors K3YB6O12:Ce3+,Tb3+ have been successfully prepared via a conventional high-temperature solid-state reaction technique. Their phase structures and luminescence properties were investigated. The green emission of Tb3+ can be largely sensitized by Ce3+ in K3YB6O12 host due to efficient Ce3+ → Tb3+ energy transfer process, which leads to broad and strong excitation band in near-ultraviolet region for K3YB6O12:Ce3+,Tb3+ phosphors. The critical distance, efficiency, and mechanism of Ce3+ → Tb3+ energy transfer are also calculated and determined in term of theoretical formulas. Upon excitation with near-ultraviolet (∼365 nm), the tunable emission-color from blue to green can be realized in the as-prepared phosphors. These results indicate that the K3YB6O12:Ce3+,Tb3+ phosphors might have potential application in near-ultraviolet pumped white light-emitting diodes.
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