Issue 31, 2017, Issue in Progress

Photoluminescence tuning of Ca8−xSrxMgGd(PO4)7:Eu2+,yMn2+ phosphors for applications in white LEDs with excellent color rendering index

Abstract

Two series of novel phosphors of green-yellow emitting Ca8−xSrxMgGd(PO4)7:Eu2+ and yellow-orange emitting Sr8MgGd(PO4)7:Eu2+,yMn2+ were successfully synthesized by a solid-state reaction. The crystal structures, photoluminescence (PL), PL excitation (PLE) spectra and decay times were investigated in detail. Upon excitation at 350 nm, the Ca4Sr4MgGd(PO4)7:Eu2+ phosphor showed strong green emission centered at 513 nm, and the Sr8MgGd(PO4)7:Eu2+ phosphor showed strong yellow emission centered at 513 nm and 593 nm, and Sr8MgGd(PO4)7:Eu2+,Mn2+ showed strong orange emission centered at 510 nm and 616 nm. In addition, a standard warm white-light emitting single-phased phosphor of Sr8MgGd(PO4)7:Eu2+,Mn2+ with chromaticity coordinates (x, y), correlated color temperature (CCT) and Commission Internationale de l'Eclairage (CIE) coordinates of (0.4497, 0.3929), 2705 K, and 89.7 was realized via energy transfer between Eu2+ and Mn2+. The energy transfer was demonstrated to be a resonant type dipole–quadrupole mechanism. Moreover, the obtained LED device exhibits an excellent color-rendering index (Ra = 97) at a correlated color temperature of 5651 K with the CIE coordinates (0.3290, 0.3410).

Graphical abstract: Photoluminescence tuning of Ca8−xSrxMgGd(PO4)7:Eu2+,yMn2+ phosphors for applications in white LEDs with excellent color rendering index

Article information

Article type
Paper
Submitted
23 Dec 2016
Accepted
24 Mar 2017
First published
31 Mar 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 19223-19230

Photoluminescence tuning of Ca8−xSrxMgGd(PO4)7:Eu2+,yMn2+ phosphors for applications in white LEDs with excellent color rendering index

J. Long, Y. Wang, C. Ma, X. Yuan, W. Dong, R. Ma, Z. Wen, M. Du and Y. Cao, RSC Adv., 2017, 7, 19223 DOI: 10.1039/C6RA28594E

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