Journal of Guangdong University of Technology ›› 2017, Vol. 34 ›› Issue (02): 40-47.doi: 10.12052/gdutxb.160027

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Luminescent Characteristics and Energy Transfer of Ba3Y(PO4)3: Sm3+, Eu3+ Red Phosphor

Huang Bao-yu, Luo Li, Wang Yin-hai, Han Chun-long   

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2016-03-02 Online:2017-03-09 Published:2017-03-09

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Abstract:

Novel Ba3Y(PO4)3:Sm3+, Eu3+(BYP:Sm3+, Eu3+) phosphor were synthesized by a standard solid-state reaction under normal ambient air and their structural and optical properties were investigated. X-ray diffraction (XRD) patterns and diffuse reflection spectra (DRS) were used to explore their structural properties. XRD showed that single cubic phase phosphor was obtained. The photoluminescence properties, energy transfer and concentration quenching were investigated in the excitation and emission spectra. Optimal doping concentration of Sm3+ in BYP:Sm3+ phosphor is just about 4% and corresponding quenching behavior is ascribed to be electric dipole-dipole interaction according to Dexter's theory. It is concluded from the excitation spectrum that 402 nm photons cannot effectively excite singly Eu3+ doped BYP phosphor to get character emission peaks of Eu3+. But when co-doped with Sm3+, character emission peaks of Eu3+ is found under the excitation of 402 nm due to the energy transfer from Sm3+ to Eu3+. Sm3+ can be used as a sensitizer and activator, this phenomenon has not been reported in the kind of matrix. It is also found that the phosphor has good absorption in the near ultraviolet (NUV) area and high emission efficiency. By the co-doping of Sm3+-Eu3+ ions, absorption spectrum became wider and stronger from ultraviolet to viewing area than that of the singly doped samples. Thus the difficulty of red commercial phosphor (Y2O3:Eu3+, Y2O2S:Eu3+) not matching well with NUV-LED chip and the problem of low luminous efficiency are solved. Furthermore, the chromaticity coordinates of BYP:Sm3+ and BYP:0.04Sm3+, 014Eu3+ phosphor are calculated to be (0.585, 0.414) and (0.617, 0.372), respectively. The chromaticity coordinates of BYP:Sm3+ can be regulated to approach the NTSC standard values of red phosphor by co-doping with Eu3+ ions. The results show that BYP:0.04Sm3+, 014Eu3+ may be a promising red-emitting phosphor for NUV-based white LED or backlight of LCD.

Key words: BYP: Sm3+, Eu3+, phosphor, energy transfer

CLC Number: 

  • O482.31

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