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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, and Teng-Ming Chen

Open Access Open Access

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.

©2010 Optical Society of America

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Figures (6)
Fig. 1
Fig. 1 X-ray powder diffraction patterns for BYP, BYP:Ce3+, BYP:Ce3+,Tb3+ (JCPDS:044-0318) and CYAB, CYAB:Eu3+ (ICSD:172154).

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Fig. 2
Fig. 2 Concentration dependence of excitation and emission intensities for (a) BYP:0.25Ce3+,xTb3+ phosphors and (b) CYAB:xEu3+ phosphors (λex = 254 nm).

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Fig. 3
Fig. 3 Relative emission intensities of (a) BYP:0.25Ce3+,0.25Tb3+ and commercial LaPO4:Ce3+,Tb3+ phosphor; (b) CYAB:0.5Eu3+ and commercial Y2O3:Eu3+ or Y2O3:Eu3+ phosphors excited at 254 nm.

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Fig. 4
Fig. 4 Temperature dependence of relative emission intensities for (a) BYP:0.25Ce3+,0.25Tb3+; (b) CYAB:0.5Eu3+ (λex = 254 nm). The insets show comparisons of thermal stability between (a) BYP:Ce3+,Tb3+ and LaPO4:Ce3+,Tb3+; (b) CYAB:Eu3+, Y2O3:Eu3+ and Y2O2S:Eu3+ (λex = 254 nm).

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Fig. 5
Fig. 5 CIE chromaticity diagram of BYP:0.25Ce3+,0.25Tb3+ and CYAB:0.5Eu3+ phosphors mixed with different weight ratios and excited at 254 nm. (1) 1:0; (2) 4:1; (3) 3:1; (4) 3:2; (5) 3:3; (6) 2:3; (7) 1:3; (8) 0:1; and commercial phosphors (9) Y2O2S:Eu3+; (10) Y2O3:Eu3+; (11) LaPO4:Ce3+,Tb3+; (12) BaMgAl10O17:Eu2+ ; (13) white-light phosphors (mixing of BYP:0.25Ce3+,0.25Tb3+、CYAB:0.5Eu3+、BaMgAl10O17:Eu2+); (14) white-light Fluorescent Lamp.

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Fig. 6
Fig. 6 PL spectrum of a fluorescent lamp fabricated using mercury vapor and mixture of BAM:Eu2+, BYP:0.25Ce3+,0.25Tb3+, and CYAB:0.5Eu3+ phosphors. The insets show the 8 W white-light fluorescent lamps.

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