Eu-doped barium strontium silicate phosphor particles prepared from spray solution containing NH4Cl flux by spray pyrolysis

Hee Sang Kang, Yun Chan Kang, Kyeong Youl Jung, Seung Bin Park

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Eu-doped barium strontium silicate phosphor particles with high photoluminescence intensity under long wavelength ultraviolet were prepared from the spray solution containing NH4Cl flux by spray pyrolysis. It was found that the addition of NH4Cl to the spray solution makes it possible to greatly improve the photoluminescence intensity of Ba 1.488Sr0.5SiO4:Eu0.012 phosphor particles under long wavelength ultraviolet of 410 nm. The highest photoluminescence intensity, which was achieved when the NH4Cl content was 5 wt.%, was about 150% of Ba1.488Sr0.5SiO 4:Eu0.012 particles prepared from the spray solution without flux material at the post-treatment temperature of 1050°C. The particle size of Ba1.488Sr0.5SiO4:Eu 0.012 phosphor particles were enlarged by using the NH4Cl flux in the spray solution because of the large grain growth which was identified from the sharpening of the XRD peaks. Adding the NH4Cl flux into the spray solution was found to lower the optimal post-treatment temperature at which the Ba1.488Sr0.5SiO 4:Eu0.012 phosphor particles are fully crystallized and have the maximum photoluminescence intensity. The phosphor particles prepared from spray solution containing 5 wt.% NH4Cl flux had the maximum photoluminescence intensity at post-treatment temperature of 1100°C.

Original languageEnglish
Pages (from-to)81-85
Number of pages5
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume121
Issue number1-2
DOIs
Publication statusPublished - 2005 Jul 25
Externally publishedYes

Keywords

  • Flux
  • LED
  • Phosphor
  • Spray pyrolysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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