Microwave synthesis of red-emitting Ca2Si5N8:Eu2+ phosphor and its photoluminescence properties for white-LEDs

Wei Chi Chou, Chin Yao Chang, Shu Chi Huang, Tsung Lin Hsieh, Shyan-Lung Chung

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A microwave synthesis method has been developed for synthesis of Ca2Si5N8:Eu2+ phosphor and its photoluminescence properties were investigated. Ca, Si, and Eu2O3 powders were used as the reactants serving as the sources of the Ca, Si and Eu. Addition of NaN3 NH4Cl and Si3N4 powders was found to increase significantly the product yield. These powders were mixed and pressed into a compact which was then embedded in AlN powder inside a BN crucible. The crucible was then placed at the center of the microwave cavity (TE103 single-mode). The microwave synthesis was performed at a microwave power (2.45 GHz) of 600 W for 1 h in a flowing 90%N2-10%H2 gas at one atmosphere. The effects of process parameters on the product yield were investigated and a reaction mechanism was proposed. The synthesized Ca2Si5N8:Eu2+ phosphor absorbs light in the region of 240–520 nm and shows a single broad band emission in the region of 550–700 nm (peaking at 596–606 nm). The peak emission intensity at an optimized Eu2O3 molar ratio (0.03) was measured to be ∼106% of the commercial YAG:Ce3+ (P46-Y3) phosphor.

Original languageEnglish
Pages (from-to)747-753
Number of pages7
JournalJournal of Alloys and Compounds
Volume782
DOIs
Publication statusPublished - 2019 Apr 25

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Phosphors
Powders
Light emitting diodes
Photoluminescence
Microwaves
Crucibles
Sodium Azide
Gases

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Chou, Wei Chi ; Chang, Chin Yao ; Huang, Shu Chi ; Hsieh, Tsung Lin ; Chung, Shyan-Lung. / Microwave synthesis of red-emitting Ca2Si5N8:Eu2+ phosphor and its photoluminescence properties for white-LEDs. In: Journal of Alloys and Compounds. 2019 ; Vol. 782. pp. 747-753.
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Microwave synthesis of red-emitting Ca2Si5N8:Eu2+ phosphor and its photoluminescence properties for white-LEDs. / Chou, Wei Chi; Chang, Chin Yao; Huang, Shu Chi; Hsieh, Tsung Lin; Chung, Shyan-Lung.

In: Journal of Alloys and Compounds, Vol. 782, 25.04.2019, p. 747-753.

Research output: Contribution to journalArticle

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