Spectroscopic Characterizations of Er doped LaPO4 Submicron Phosphors prepared by Homogeneous Precipitation Method

Kumar, GA and Shenoy, Vittal and Santhosh, C (2016) Spectroscopic Characterizations of Er doped LaPO4 Submicron Phosphors prepared by Homogeneous Precipitation Method. Optical Materials, 53 (1). pp. 24-29. ISSN 0925-3467

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Abstract

Hexagonal shaped LaPO4 submicron particles doped with various concentrations of Er were successfully prepared by homogenous precipitation method using metal nitrates and ammonium phosphate. Particles of approximate particle size 125 nm and size distribution of 85 nm are obtained with good crystallinity.After heat treatment at 1200 �C for 2 h, the particles are characterized for their various optical properties such as absorption, emission, fluorescence decay and optical band gap. Optical absorption and emission data are numerically analyzed with the help of Judd–Ofelt model to evaluate various radiative spectral properties such as radiative decay rates, radiative quantum yield, emission cross-section and fluorescence branching ratios of various emission transitions. Though the radiative quantum yield of 1554 nm emission approaches the theoretical limit of 100%, the experimentally measured quantum yield is only 11% at 12 W/cm2 at 980 nm excitation power density in 2% Er doped LaPO4

Item Type: Article
Uncontrolled Keywords: Phosphor; Orthophosphate; Judd–Ofelt; Emission cross-section and quantum yield
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Library
Date Deposited: 28 Dec 2017 09:25
Last Modified: 28 Dec 2017 09:25
URI: http://eprints.manipal.edu/id/eprint/150371

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