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A novel highly thermal-stable Ca2GaNbO6: Sm3+ phosphor with excellent color purity for high CRI wLEDs and security ink

Yanzhi Zhang,Xiang Guo,Minghao Zhang,Ruirui Cui,Jun Zhang,Chaoyong Deng

In this study, a Sm 3+ ion-doped double perovskite structure oxide was developed to obtain a novel Ca 2 GaNbO 6 : Sm 3+ orange-red phosphor, which has compensated for the lack of a red component in commercial wLEDs . The results of morphological features and phase structure have confirmed that the synthesized compound maintains the same structure as Ca 2 GaNbO 6, and that Sm 3+ successfully enters into the main lattice of Ca 2 GaNbO 6 . In terms of optical properties , the photoluminescence (PL) emission spectra monitored at 406 nm has the strongest emission peak at 599 nm and shows strong orange-red light. The spectral shapes of PL at different concentrations remain consistent without wavelength drift, and perform best when the concentration is 3 mol%, that is, the concentration quenching point is 3 mol%. The quenching phenomenon is believed to be mainly attributed to dipole-dipole (d-d) interaction. The Ca 2 GaNbO 6 : 0.03Sm 3+ phosphor shows excellent color purity (CP = 99.0 %) and low color temperature (CCT = 1664 K) in terms of chromaticity (CIE). In terms of heat resistance , the thermal stability of Ca 2 GaNbO 6 : 0.03Sm 3+ phosphor is 82.80 % (423 K). The internal quantum efficiency (IQE) is 34.4 %. In terms of applications, the wLEDs made of Ca 2 GaNbO 6 : 0.03Sm 3+ phosphor emits warm white light and exhibit excellent performance in color rendering index and correlated color temperature (CRI = 94.5, CCT = 3877 K). At the same time, Ca 2 GaNbO 6 : Sm 3+ phosphor shows good solubility in PVA . Research shows that Ca 2 GaNbO 6 : Sm 3+ phosphor has good performance in the fields of wLEDs and security ink.