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Proceedings Paper

Infrared excited Yb:Er: Y2O2S phosphors with intense emission for lighting applications
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Paper Abstract

Yb and Er-doped Y2O2S phosphor was synthesized by solid state flux fusion method and their upconversion spectral properties were studied as a function of different Yb concentrations. The solid state flux fusion results in well crystallized hexagonal shaped phosphor particles of average size 3.8 μm. The detailed optical characterizations such as absorption, emission, and fluorescence decay were performed to explore the emission processes in the UV-VIS-NIR as well as to quantitatively estimate the fluorescence quantum yield. Upconversion spectral studies show that for all the compositions, green emissions are stronger, particularly; the green emission intensity is 1.7 times stronger than the red one with composition of 8 mol% Yb and 1 mol% Er. Mechanisms of upconversion by two photon and energy transfer processes are interpreted and explained. The color coordinates are measured and the color tunability was analyzed as a function of the 980 nm excitation power. Results show that the Y2O2S:Yb,Er phosphor offers power dependent color tuning properties where the emission color can be tuned from 490 to 550 nm by simply changing the 980 nm excitation power from 10 to 50 mW.

Paper Details

Date Published: 6 February 2012
PDF: 8 pages
Proc. SPIE 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI, 82780E (6 February 2012); doi: 10.1117/12.906804
Show Author Affiliations
G. A. Kumar, The Univ. of Texas at San Antonio (United States)
Madhab Pokhrel, The Univ. of Texas at San Antonio (United States)
D. K. Sardar, The Univ. of Texas at San Antonio (United States)


Published in SPIE Proceedings Vol. 8278:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Norbert Linder, Editor(s)

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