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

G. A. Kumar; Madhab Pokhrel; D. K. Sardar

doi:10.1117/12.906804

6 February 2012 Infrared excited Yb:Er: Y₂O₂S phosphors with intense emission for lighting applications

G. A. Kumar, Madhab Pokhrel, D. K. Sardar

Proceedings Volume 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI; 82780E (2012) https://doi.org/10.1117/12.906804
Event: SPIE OPTO, 2012, San Francisco, California, United States

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.

Citation Download Citation

G. A. Kumar, Madhab Pokhrel, and D. K. Sardar "Infrared excited Yb:Er: Y₂O₂S phosphors with intense emission for lighting applications", Proc. SPIE 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI, 82780E (6 February 2012); https://doi.org/10.1117/12.906804

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