Structural and NIR to visible upconversion properties of Er3+-doped LaPO4 phosphors

Author(s)

Kesavulu, C. R. ^{[1, 2]} ; Basavapoornima, Ch. ^[1] ; Viswanath, C. S. Dwaraka ^[1] ; Jayasankar, C. K. ^[1]

Affiliation

^[1] Sri Venkateswara Univ, Dept Phys, Tirupati 517502, Andhra Pradesh - India

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, Av Trabalhador Stiocarlense 400, Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of Luminescence; v. 171, p. 51-57, MAR 2016.
• Web of Science Citations: 19

Abstract

Various concentrations of Er3+-doped LaPO4 powder phosphors have been synthesized by the conventional solid state reaction method and are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, field emission scanning electron microscopy and upconversion emission measurements. The XRD results show that all the concentration of Er3+-doped samples are assigned to the monoclinic monazite type structure of the LaPO4 phase. An intense green emission band at 547 nm (S-4(3/2) -> I-4(15/2)) along with a weak red emission at 657 nm (F-4(9/2)-> I-4(15/2)) are observed under NIR excitation with 975 nm laser diode. Energy transfer and upconversion fluorescence properties of Er3+-doped phosphors have also been studied. The possible mechanisms involved in the upconversion process have been discussed and compared with other reported systems. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 12/19338-9 - Nonlinear n2 spectroscopy in ion doped solids
• Grantee: Kesavulu Culala Rajasekharaudayar
• Support Opportunities: Scholarships in Brazil - Post-Doctoral