A novel single-phase Ba3P4O13:Dy3+,Eu3+ phosphor with tunable-emission and high thermal stability

A novel single-phase Ba3P4O13:Dy3+,Eu3+ phosphor was prepared via calcining the precursor synthesized through a co-precipitation method. The photoluminescence properties of the samples excited by near-ultraviolet (NUV) light were investigated. It was found that the optimal content of Dy3+ in Ba3P4O13:Dy3+ was 6% and the concentration quenching occurred as dipole-dipole interactions. The emission spectrum of Dy3+ and Eu3+ co-doped Ba3P4O13 phosphor showed blue and yellow peaks (F-4(9/2) -> H-6(15/2), (13/2)) of Dy3+ as well as red peaks (D-5(0) -> F-7(1, 2, 3, 4)) of Eu3+, which integrated into a warm white emission with the chromaticity coordinates of (0.3808, 0.3710) and the correlated color temperature (CCT) of 3921 K. Notably, the energy transfer from Dy3+ to Eu3+ was verified by the fluorescence decay curves. Furthermore, tunable emission from cold-white to yellowish-white was obtained via regulating the concentration of Eu3+ or the wavelength of the excitation light. Moreover, this phosphor manifested excellent thermal stability. The results indicated that Ba3P4O13:Dy3+,Eu3+ phosphor could be a potential mono-phase converter for WLEDs pumped by near-UV chips.