期刊
CERAMICS INTERNATIONAL
卷 49, 期 7, 页码 11393-11401出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.11.338
关键词
Fluoroperovskite; WLEDs; Critical distance; Phosphors; Radiation dosimetry
A series of novel orange-red emitting RbCaF3:0.05Eu3+ phosphors were synthesized, and their composition, structure, and optical properties were studied. The phosphors exhibited efficient excitation under near ultraviolet (nUV) light and emitted a sharp peak at 590 nm. The potential application of RbCaF3:0.05Eu3+ as an orange-red emitting phosphor for white light emitting diodes was also discussed.
A series of novel orange-red emitting RbCaF3:0.05Eu3+ phosphors were synthesized by solid-state reaction technique. Phase formation and crystal structure of RbCaF3 were investigated through powder X-ray diffraction patterns and Rietveld refinement. Through X-ray photoemission spectroscopy, their composition and nature of oxidation states were determined. These fluoroperovskite phosphors are efficiently excited by near ultraviolet (nUV-394 nm) and a corresponding sharp emission peak is exhibited at 590 nm. This peak can be attributed to the 5D0 -> 7F1 transition of the magnetic dipole. A concentration quenching effect can be observed with increasing Eu3+ ion concentration. The Commision Internationale del'Eclairage (CIE) chromaticity coordinates (x = 0.5764, y = 0.4277) of the RbCaF3: 0.05Eu3+ phosphors excited at 394 nm. Thermally stimulated luminescence (TSL) was carried out and analyzed for the trap depth (E) and frequency factor values. The above results indicate that the RbCaF3:0.05Eu3+ can be a potential orange-red emitting phosphor for white light emitting diodes.
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