Luminescence enhancement of Eu-doped calcium magnesium silicate blue phosphor for UV-LED application

Kyeong Youl Jung, Joo Hyun Kim, Yun Chan Kang

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

(Ca1-x,Eux)MgSi2yO6+δ blue phosphor was prepared by spray pyrolysis and the photoluminescence properties were optimized by controlling concentration of Si element and the activator content. At y=1.0, the concentration quenching in the luminescent intensity appeared when the Eu2+ content (x) was 0.01 (1 at%). Such quenching concentration was changed with the concentration of silicon (y), which was increased with an increase in the quantity of excess Si (y>1.0). The highest luminescent intensity was achieved when the Eu2+ content (x) and the Si concentration (y) were 0.04 and 1.3, respectively. According to X-ray diffraction (XRD) analysis, the tetragonal SiO2 phase was formed as a minor phase when the y value was larger than 1.3. The formation of SiO2 phase, however, did not reduce but increased the luminescent intensity when the Eu2+ content was optimized again. As a result, the luminescent intensity of the phosphor particles optimized in the content of both Si and Eu2+ was about 150% improved compared with that of the CaMgSi2O6:Eu sample (x=0.01, y=1.0).

Original languageEnglish
Pages (from-to)615-619
Number of pages5
JournalJournal of Luminescence
Volume129
Issue number6
DOIs
Publication statusPublished - 2009 Jun

Keywords

  • Calcium magnesium silicate
  • LED
  • Luminescence
  • Phosphor

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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