Spectroscopic characterizations of Er doped LaPO4 submicron phosphors prepared by homogeneous precipitation method |
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| Affiliation: | 1. Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, United States;2. International School of Photonics, Cochin University of Science and Technology, Kochi 682022, India;3. Department of Atomic and Molecular Physics, Manipal University, Manipal 576104, India;1. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary;2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroc?aw, Poland;1. Instituto de Cerámica y Vidrio, CSIC, C/Kelsen 5, Madrid 28049, Spain;2. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, Avda. de Elvas S/N, Badajoz 06006, Spain;1. Department of Physics, DAV College, Amritsar, Punjab 143001, India;2. Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005, India;1. Department of Physics, ICFAI University, Raipur, CG, India;2. Department of Physics, Govt. VYT PG Autonomous College, Durg, CG, India;3. Department of Electronics and Communication, ICFAI University, Raipur, CG, India |
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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. |
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| Keywords: | Phosphor Orthophosphate Judd–Ofelt Emission cross-section and quantum yield |
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