Abstract
The development of efficient luminescent materials that can compensate for the cyan gap is essential for actualizing high-quality full-spectrum white light-emitting diode (wLED) illumination. In this paper, a novel blue-emitting phosphor Gd3SbO7:Bi3+ was synthesized with an emission center located at 449 nm. Based on the cation substitution strategy, the cyan-emitting Gd3TaO7:Bi3+ phosphor is developed by completely replacing Sb5+ ions with Ta5+ ions in Gd3SbO7:Bi3+. Compared with Gd3SbO7:Bi3+, Gd3TaO7:Bi3+ also has an orthorhombic phase with the space group Ccmm, except that its emission wavelength is red-shifted by 45 nm from 449 to 494 nm, and the luminescence color is changed from blue to cyan. Thermal stability measurements demonstrate the negative effect of increasing Ta5+ doping concentration on the thermal stability of Gd3SbO7:Bi3+ phosphors. And a full-spectrum wLED device was fabricated using Gd3SbO7:Bi3+, Gd3TaO7:Bi3+, commercial (Sr, Ba)2SiO4:Eu2+ and CaAlSiN3:Eu2+ phosphors, with an impressive color rendering index (Ra = 94.7, R9 = 93) and suitable correlated color temperature (5832 K). The research results demonstrate the important role of Gd3TaO7:Bi3+ phosphors in compensating the cyan gap, and also provide new insights into the application of cyan phosphors in full-spectrum white light illumination.
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