Enhancing Luminescence of SrBPO5: Sm3+ Phosphor by Codoping Alkali Metal for White LEDs

doi:10.15541/jim20150623

Abstract

Abstract:

An orange reddish phosphor SrBPO₅:Sm³⁺ was synthesized by the traditional solid-state method. The phosphor component was characterized by the X-ray powder diffraction (XRD). The photoluminescence excitation (PLE) and emission spectra (PL) were investigated. The influence of the concentration of Sm³⁺ ions on luminescence properties of samples and concentration quenching mechanism were investigated. The results show that the as-prepared phosphor can be excited by 342 nm, 358 nm, 370 nm and 399 nm UV light and the strongest one at 399 nm. On being excited by 399 nm, the sample emits yellow, orange and red emission at different wavelength. The optimal activator molar fraction in this phosphor is 0.016 and the only sintering temperature is 1000℃. It is meant for enhancing the emission intensity of SrBPO₅:Sm³⁺phosphor if appropriate Li⁺ ions are added as charge compensator. The thermal stability was evaluated by emission spectra of phosphor at different measuring temperatures. This research studied the influence of reaction temperature and charge compensator on the luminescence characteristics. The chromaticity coordinates of SrBPO₅:Sm³⁺, R⁺ phosphor was explored. The results indicate that SrBPO₅:Sm³⁺, Li⁺ is a potential orange-reddish phosphor in near UV based white LEDs.

Key words: luminescence, SrBPO5:Sm3+, Li+, rare earth, spectral properties

CLC Number:

O433

YANG Jing-Wei, LI Xu, JIAO Dian, WU Meng-Ying, WANG Yi-Bing, GUAN Li, GUO Qing-Lin, TENG Feng. Enhancing Luminescence of SrBPO₅: Sm³⁺ Phosphor by Codoping Alkali Metal for White LEDs[J]. Journal of Inorganic Materials, 2016, 31(8): 876-880.

Figures/Tables 8

Fig. 1 XRD patterns of xSm3+ doped SrBPO5 phosphor (a) and influence of Sm3+ concentration on the crystal lattice parameters (b)

Fig. 2 Excitation spectra of SrBPO5:Sm3+ phosphor monitoring for different emission peaks

Fig. 3 Emission spectra of SrBPO5:Sm3+ phosphor excited by different wavelength light

Fig. 4 Schematic energy level diagram of Sm3+ ions and the possible energy transfer

Fig. 5 Influence of Sm3+ concentration on the emission of SrBPO5:Sm3+ phosphor

Fig. 6 Emission spectra of SrBPO5:Sm3+ phosphor sintered at different temperatures

Fig. 7 Emission spectra of SrBPO5:Sm3+ phosphor prepared with different charge compensators

Fig. 8 Emission spectra of SrBPO5:Sm3+, Li+ phosphor at different temperatures

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Enhancing Luminescence of SrBPO₅: Sm³⁺ Phosphor by Codoping Alkali Metal for White LEDs

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