Abstract
This paper reports a systematic investigation on photoluminescent (PL) properties of and -activated The excitation spectrum of consists of the strong CTS absorption and week f-f transitions of while the excitation spectrum of is composed of the strong d-f transition and weak f-f transitions of The charge transfer state (CTS) band of and the d-f peak of slightly shift to lower energy with increase of dopant contents. exhibits red emission peaks around 610-620 nm, which is related to the transitions of The luminescence of is dominated by green emission peaks at 546 nm, which can be attributed to the transition of For codoped energy transfer process takes place and the resonant mechanism is proposed as the transfer mechanism which can be described as: PL spectra and lifetime measurements support this mechanism. Due to the energy transfer, PL intensity of emission increased about 40%. © 2003 The Electrochemical Society. All rights reserved.
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