Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Study on the Luminescent Characteristics of YPO4:Pr3+ Phosphor by the Content Ratio of Pr6O11 and Calcination Temperature

Pr6O11의 함량 및 열처리 조건에 따른 YPO4:Pr3+ 형광체의 발광 특성 연구

  • Min Jun Kim (Department of Advanced Material, Tech University of Korea) ;
  • Seong Eui Lee (Department of Advanced Material, Tech University of Korea)
  • 김민준 (한국공학대학교 신소재공학과) ;
  • 이성의 (한국공학대학교 신소재공학과)
  • Received : 2023.09.20
  • Accepted : 2023.10.16
  • Published : 2024.01.01
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Abstract

In this study, the praseodymium-doped yttrium phosphate (YPO4:Pr3+) powder, which is well known for its high luminescent efficiency, and long life in the UV range, was synthesized with various content ratios of Pr6O11 and calcination temperature. Crystal structure and luminescent properties of various phosphor powders based on different concentrations and calcination conditions were characterized by XRD (X-Ray Diffraction) and PL (photoluminescence) spectrometers. From the XRD analysis, the structure of YPO4:Pr3+ which is calcinated at 1,200℃ was stable tetragonal phase and crystal size was calculated about 25 nm by Scherrer equation. PL emission of YPO4:Pr3+ with a different content ratio of Pr6O11 by excitation λexc=250 nm shows that 0.75 mol% phosphor powder has maximum PL intensity and PL decreases with the increase of the ratio of Pr6O11 up to 1.25 mol% which is caused by changes of crystallinity of phosphor powders. With increasing dopant ratio, photo-luminescence Emission decreases due to Concentration quenching, which is commonly observed in phosphors. Currently, 0.75 mol% is considered the optimal doping concentration. A hybrid ultraviolet-emitting device incorporating YPO4:Pr3+ fluorescent material with plasma discharge was fabricated to enhance UV germicidal effects while minimizing ozone generation. UV emission from the plasma discharge device was shown at about 200 nm and 350 nm which caused additional emission of the regions of 250 nm, 315 nm, and 370 nm from the YPO4:Pr3+ phosphor.

Keywords

Acknowledgement

본 연구는 교육부가 지원하는 한국연구재단(NRF)의 대학중점연구소 지원사업(NRF-2017R1A6A1A03015562) 과 2021년도 한국공학대학교 연구년 지원사업으로 수행된 연구임.

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