A Novel Red-emitting GdSr₂AlO₅:Eu³⁺ Phosphors for Solid-State Lighting: Synthesis and Luminescence

• 발행기관: 한국방사선학회
• 저자명: 박진영 양현경 제재용
• 간행물 정보: 『한국방사선학회 학술대회 논문집』한국방사선학회 2017년 추계종합학술대회논문집, 81~81쪽, 전체 1쪽
• 주제분류: 공학 > 기타공학
• 파일형태: PDF
• 발행일자: 2017.11.10

영문 초록

In recent years, the solid state white-light emitting diodes (WLEDs) have more advantages than the traditional incandescent or fluorescent lamps, because several reports suggested that the WLEDs would reduce global electricity consumption by about 50% by taking advantage of the conversion from direct electricity to light rather than the processes in which light is the by-product of another conversion, as with traditional lamps. It is well known that rare earth (RE) ions activated phosphors have found excellent luminescent materials because of their marked improvements in lumen output, color rending index, energy efficiency and greater radiation stability. In this study, a series of Eu³⁺ ions doped GdSr₂AlO₅ (GSA) phosphors have been synthesized by on a citric acid based sol-gel method and annealed at 1300 °C. The XRD patterns confirm that the GSA phosphors annealed at 1300 °C have a tetragonal structure and the scanning electron microscope image showed the closely packed particles. The luminescence properties of these phosphors have been carried out by the emission and excitation spectra along with lifetime measurements. The excitation spectra of GSA:Eu3+ phosphors shows a broad band due to the charge transfer transition(O₂⁻→Eu³⁺) in shorter wavelength region and some narrow peaks due to the f-ftransition of Eu³⁺ ion in the longer wavelength region. In the emission spectra, GSA:Eu³⁺ phosphors show an efficient red emission due to ⁵D₀→⁷F₂ transition. The dynamics of the phosphors have been investigated by decay curves measurements.

키워드

GdSr₂AlO₅ :Eu³⁺ red phosphor