Synthesis, crystal structure and photoluminescence properties of new blue-green Ba1−x(PO3)2:Eux2+ (0 < x ≤ 0.040) phosphors for near ultraviolet based white light-emitting diodes

• Main Authors: Wu, Zhan-Chao, Fu, Hong-Hong, Liu, Jie, Kuang, Shao-Ping, Wu, Ming-Mei, Xu, Jun-Gu, Kuang, Xiao-Jun
• Format: Article
• Language: English
• ISSN: 2046-2069
• DOI: 10.1039/c5ra01755f

A series of new blue-green Ba 1− x (PO 3 ) 2 :Eu x 2+ ( x = 0.005, 0.010, 0.020, 0.030, 0.035, 0.040) phosphors were synthesized by a solid-state reaction. The phase purities and crystal structures of the series were characterized by X-ray diffraction (XRD) and Rietveld refinements. Their photoluminescence properties were investigated by means of excitation, emission spectra and Commission International de L'Eclairage (CIE) chromaticity coordinates. The concentration quenching mechanism of Eu 2+ emission in Ba(PO 3 ) 2 hosts was studied. Thermal stability was evaluated by temperature-dependent luminescence of Ba 0.970 (PO 3 ) 2 :Eu 0.030 2+ phosphor. Moreover, the activation energy ( E a ) for thermal quenching was calculated. The photoluminescence of Ba 0.970 (PO 3 ) 2 :Eu 0.030 2+ phosphor shows higher thermal stability than that of the commercial blue phosphor BaMgAl 10 O 17 :Eu 2+ (BAM). All the results show that Ba(PO 3 ) 2 :Eu 2+ phosphor is a potential blue-green phosphor for near ultraviolet-based white light-emitting diodes (WLED). The luminescence of Ba 0.970 (PO 3 ) 2 :Eu 0.030 2+ shows higher thermal stability than that of commercial blue phosphor BAM.