Abstract
YPO4:x mol.% Eu3+ phosphors with different dopant concentrations (x = 3, 5, 8, 11, 13) have been synthesized via high-temperature solid-state reaction. X-ray diffraction analysis and Raman and infrared (IR) spectroscopy were applied for detailed structural characterization. Under excitation at wavelength of 395 nm, the photoluminescence spectra displayed the 5D0 → 7F J (J = 1, 2, 3, 4) intra-4f shell transitions related to Eu3+ ion. The radiative lifetime was estimated using the Ω 2 and Ω 4 Judd–Ofelt intensity parameters. The highest luminescence intensity was achieved for an optimal europium concentration of 11 mol.%. The critical energy-transfer distance for Eu3+ ions was evaluated to be 10.74 A. We also studied the temperature-dependent photoluminescence and Commission Internationale de l’Eclairage chromaticity diagram. It was found that Eu3+-doped YPO4 exhibited good thermal stability and its emission intensity decreased slightly above room temperature. In addition, the color purity of this phosphor was as high as 91% for the YPO4:13% Eu3+ sample, making it a potential orange–red phosphor for application in ultraviolet-pumped white light-emitting diodes.
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