NaBaY(BO ₃ ) ₂ :Ce ³⁺ ,Tb ³⁺ : A novel sharp green‐emitting phosphor used for WLED and FEDs

Abstract

Abstract A new borate phosphor NaBaY(BO 3 ) 2 : Ce 3+ , Tb 3+ (NBY:Ce 3+ , Tb 3+ ) was successfully synthesized under low temperature designed to put into application in the fields of ultraviolet (UV)‐excited light emitting diodes (LEDs) and field emission displays (FEDs). The structure distortion between Ce 3+ , Tb 3+ single‐ and co‐doping NBY was discussed by X‐ray powder diffraction Rietveld refinement, high‐resolution transmission electron microscopy (HRTEM) and spectra. NBY: Ce 3+ , Tb 3+ presents a wide absorption band ranging from 310 to 400 nm and efficient green emission (λ max = 542 nm) with a full‐width at half‐maximum of 3.3 nm. The remarkable thermal stability has also been tested, indicating that the intensity at 200°C is still beyond 70% of the original intensity. In addition, a white LED device was manufactured by connecting a 370 nm UV chip with a blend of BaMaAl 10 O 17 : Eu 2+ (BAM: Eu 2+ ), NBY: Ce 3+ , Tb 3+ and CaAlSiN 3 : Eu 2+ . The color coordinate, correlated color temperature and color rendering index of the manufactured LED device were (0.335, 0.347), 5511 K and 80.16, respectively. Meanwhile, the cathodoluminescence (CL) spectra under the various conditions of probe currents and accelerating voltages were also analyzed. Through successive excitation of low‐voltage electron‐beam, the wonderful performances of degradation property and color stability were obtained. These results suggest that the green‐emitting NBY: Ce 3+ , Tb 3+ phosphor has the prospect of becoming applications in white UV LEDs and FEDs.