Variable light emission by the mixture of 1:1 ratio of LiNa3P2O7:Sm3+ and LiNa3P2O7:Tb3+ phosphor under near UV excitation

Variable light emitting single-composition phosphor is synthesised via solid state reaction (SSR) method by taking equal weights of LiNa3P2O7:0.09Sm3+ (red emission) and LiNa3P2O7:0.09Tb3+ (green emission) phosphors. Phase formation of the compound was confirmed by powder X-ray diffraction (XRD) analysis and morphology of the sample was analysed using a field-emission scanning electron microscope (FE-SEM). Optical properties of sample was studied and results show that the phosphor can be excited effectively by near-ultraviolet light-emitting diodes of wavelength 374 nm and 401 nm. Phosphor emits bluish-green light under excitation energy of wavelength 374 nm and yellow light at 401 nm excitation. The chromatic properties of the LiNa3P2O7: 0.09Sm & 0.09Tb phosphor have been found to have chromaticity coordinates of (0.185, 0.324) and CRI is 41, under the excitation of 374 nm, under 401 nm excitation it emits light with chromaticity coordinates (0.4663,0.5102) and CRI is 56.