Luminescence properties of Pr3+ and Bi3+ co-doped NaCaTiNbO6 phosphor for red-LEDs

Abstract This paper investigates the photoluminescence properties of NaCaTiNbO 6 :Pr 3+ and NaCaTiNbO 6 :Pr 3+ , Bi 3+ phosphors. NaCaTiNbO 6 :Pr 3+ and NaCaTiNbO 6 :Pr 3+ ,Bi 3+ powder were synthesized successfully by solid state reaction method. Phase purity was checked using X-ray powder diffractometry (XRD). The excitation and emission spectra were recorded to elucidate the photoluminescence properties of NaCaTiNbO 6 :Pr 3+ and NaCaTiNbO 6 :Pr 3+ ,Bi 3+ . Furthermore, fluorescence lifetime measurements were performed. The excitation spectra of NaCaTiNbO 6 :Pr 3+ show a main band centered at around 357 nm. The luminescence spectra of NaCaTiNbO 6 :Pr 3+ exhibit a red emission peak at 615 nm from the 1 D 2  →  3 H 4 transition of Pr 3+ ions. With the introduction of the Bi 3+ ion into NaCaTiNbO 6 :Pr 3+ , the luminescence intensity is enhanced nearly two times. Meanwhile, the absorption band edge of NaCaTiNbO 6 :Pr 3+ is shifted from 380 to 420 nm. Thus, this study shows that the red phosphor NaCaTiNbO 6 :Pr 3+ incorporated with Bi 3+ is advantageous for light-emitting diode applications.