Thermally stable green Ba3Y(PO4)3:Ce3+, Tb3+ and red Ca3Y(AlO)3(BO3)4:Eu3+ phosphors for white-light fluorescent lamps

Chien Hao Huang, Te Wen Kuo, Teng-Ming Chen

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Abstract

A class of thermal stable of green-emitting phosphors Ba3Y(PO4)3:Ce3+, Tb3+ (BYP:Ce3+, Tb3+) and red-emitting phosphors Ca3Y(AlO)3(BO3)4:Eu3+ (CYAB:Eu3+) for white-light fluorescent lamps were synthesized by high temperature solid-state reaction. We observed a decay of only 3% at 150 °C for BYP:0.25Ce3+, 0.25Tb3+ (3% for LaPO4:Ce3+, Tb3+), and a decay of 4% for CYAB:0.5Eu3+ (7% for Y2O3:Eu3+, 24% for Y2O2S:Eu3+). The emission intensity of composition-optimized Ba3(Y0.5Ce0.25Tb0.25)(PO4)3 is 70% of that of commercial LaPO4:Ce3+, Tb3+ phosphors, and the CIE chromaticity coordinates are found to be (0.323, 0.534). The emission intensity of Ca3(Y0.5Eu0.5)(AlO)3(BO3)4 is 70% and 83% of those of Y2O3:Eu3+ and Y2O2S:Eu3+ phosphors, respectively, and the CIE chromaticity coordinates are redder (0.652, 0.342) than those of Y2O3:Eu3+ (0.645, 0.347) and Y2O2S:Eu3+ (0.647, 0.343). A white-light fluorescent lamp is fabricated using composition-optimized Ba3(Y0.5Ce0.25Tb0.25)(PO4)3 and Ca3(Y0.5Eu0.5)(AlO)3(BO3)4 phosphors and matching blue-emitting phosphors. The results indicate that the quality of the brightness and color reproduction is suitable for application in shortwave UV fluorescent lamps. The white-light fluorescent lamp displays CIE chromaticity coordinates of x = 0.33, y = 0.35, a warm white light with a correlated color temperature of 5646 K, and a color-rendering index of Ra = 70.

Original languageEnglish
Pages (from-to)A1-A6
JournalOptics Express
Volume19
Issue number101
DOIs
StatePublished - 3 Jan 2011

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