Luminescent Properties of a Novel Red-Emitting Phosphor Ca_1.95P₂O₇:0.05Eu³⁺, B³⁺, M⁺ (M=Li, Na, K) for White Light-Emitting Diodes

Abstract:

A series of Ca_1.95P₂O₇:0.05Eu³⁺, B³⁺, M⁺ (M=Li, Na, K) phosphors were prepared by combustion synthesis method using boric acid as flux and M⁺ as charge compensator. The crystal structure and luminescent properties were investigated. The emission spectra show that the most intensive emission peak is located at 612nm, corresponding to the ⁵D₀-⁷F₂ transition of Eu³⁺. The phosphors can be efficiently excited by 394nm and 464nm light, which are matched well with the emission wavelength of near UV and blue light-emitting chips, respectively. The results show that boric acid is effective in improving the luminescence intensity, and the optimum molar ratio of boric acid to the pyrophosphate is 0.09. The relative emission intensities of Eu³⁺ (⁵D₀-⁷F₂) in Ca₂P₂O₇:Eu³⁺ phosphors with M⁺ (M=Li, Na, K) introduced as charge compensator are significantly enhanced, and the phosphor added with Na+ show the strongest emission.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 2481-2484
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.2481
• Online since: January 2013
• Authors: Mi Fang Yan, Li Hong Xue, You Wei Yan
• Keywords: Ca₂P₂O₇:Eu³⁺, Charge Compensation, Flux Agent, Luminescence

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