A Novel Double-Perovskite Structure Mg2yvo6:Sm3+ Phosphor with Zero Thermal Quenching Characteristics for W-Leds and Latent Fingerprint Development

Abstract

Novel orange-red Mg2YVO6:Sm3+ phosphors were synthesized via a high-temperature solid-phase reaction. The purity of Mg2YVO6:Sm3+, scanning electron microscope (SEM) image, element distribution, photoluminescence (PL), thermal stability, white light-emitting diode (w-LED) application, and so on were studied. Due to O2-→V5+ and O2-→Sm3+ charge transfer band (CTB), the phosphors show unique broadband excitation characteristics. Under excitation at 408 nm, the characteristic peaks were consistent with transitions from the 5G5/2 to 6HJ (J = 5/2, 7/2, 9/2, and 11/2) energy levels at wavelengths of 565, 601, 647, and 714 nm, emitting bright orange-red light. The optimum concentration of doping was 5 mol%, and the quenching mechanism was attributed to neighboring ions interactions. Mg2YVO6:5 mol%Sm3+ showcased remarkable thermal stability, retaining 100.2% of its initial luminescence intensity even as the temperature escalated to 420 K. Combined with a 408 nm chip, the successfully encapsulated white LED exhibited good color rendering index (Ra = 85) and color temperature (CCT = 5889 K). Moreover, Mg2YVO6:Sm3+ phosphor demonstrates remarkable potential in latent fingerprint (LFP) development under ultraviolet lamp irradiation. It can assist in identifying the I-III level features in latent fingerprints and can be effectively combined with fingerprint impressions found on various everyday objects to achieve a development effect. Hence, it is evident that Mg2YVO6:Sm3+ holds significant application prospects in the fields of w-LED lighting and fingerprint recognition.

Keywords: Mg2YVO6:Sm3+, Phosphors, Zero thermal quenching, White light-emitting diodes, Latent fingerprint development