Issue 67, 2015

Synthesis, photoluminescence and Judd–Ofelt analysis of red LiGd5P2O13 : Eu3+ phosphors for white LEDs

Abstract

A series of LiGd5P2O13 : Eu3+ phosphors with a red-emitting band centered at 622 nm were synthesized by a high temperature solid-state reaction method. Structure-luminescence correlation, concentration quenching and thermal stability of the LiGd5P2O13 : Eu3+ phosphors were studied combined with XRD, PL/PLE spectra as well as temperature-dependent PL and decay curves. The optimum concentration of Eu3+ doped in the LiGd5P2O13 is 20 mol%, and the corresponding concentration quenching mechanism is found to be via dipole/quadrupole–quadrupole interactions. Intensity parameters (Ω2 and Ω4) and various radiative properties such as transition rates (A), branching ratios (β) and stimulated emission cross-section (δe) were calculated using the Judd–Ofelt theory. LiGd5P2O13 : Eu3+ exhibited good thermal stability and its emission intensity decreased slightly at temperature above 150 °C. The CIE coordinates of LiGd5P2O13 : 0.20Eu3+ (0.644, 0.339) are very close to s-RGB standard red (0.640, 0.330), and the corresponding quantum efficiency is 46.5%. The results show that LGPO : Eu3+ may be considered as a potential red emitting phosphor for NUV/blue pumped WLEDs.

Graphical abstract: Synthesis, photoluminescence and Judd–Ofelt analysis of red LiGd5P2O13 : Eu3+ phosphors for white LEDs

Article information

Article type
Paper
Submitted
14 Apr 2015
Accepted
12 Jun 2015
First published
12 Jun 2015

RSC Adv., 2015,5, 54622-54628

Author version available

Synthesis, photoluminescence and Judd–Ofelt analysis of red LiGd5P2O13 : Eu3+ phosphors for white LEDs

X. Zhang, L. Zhou, Q. Pang and M. Gong, RSC Adv., 2015, 5, 54622 DOI: 10.1039/C5RA06680H

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