Emission enhancement of bifunctional La2MoO6:Sm3+ nanoparticles by doping Y3+ ions for flexible display and high CRI WLEDs

Abstract

Red-emitting La2MoO6:xSm3+ and La2MoO6:xSm3+/yY3+ nanoparticles-based phosphors were prepared via a traditional sol-gel reaction technique. The crystal structure, elemental composition, morphology, luminescent properties and thermal stability of the obtained samples were analyzed in detail. Under 406 nm light excitation, all the obtained samples showed the characteristic emission of Sm3+ ions while the optimum concentration was 2 mol% in which chromatic coordinate was measured to be (0.593, 0.406). Meanwhile, a series of Y3+ ion concentrations were used to activate La2MoO6:0.02Sm3+ nanoparticles and the photoluminescence emission intensity of La2MoO6:0.02Sm3+/yY3+ nanoparticles gradually increased with the increase of Y3+ ion concentration. Moreover, the La2MoO6:0.02Sm3+/0.05Y3+-polydimethylsiloxane film was prepared and exhibited pure red light under near-ultraviolet light irradiation. Finally, the packaged white light-emitting diode (WLED) device was fabricated and exhibited a bright white-emitting glow with high color rendering index (CRI) value of 84.45 under a forward bias current of 150 mA, further suggesting that the Y3+-activated La2MoO6:Sm3+ nanoparticles could enhance the emission intensity and are a potential candidate for flexible display and high CRI WLEDs.