Emission Enhancement and Energy Transfers in YV_0.5P_0.5O₄ Nanoparticles Codoped with Eu³⁺ and Bi³⁺ Ions

Abstract

In this study, solid-state solutions of yttrium orthovanadate-phosphate with varying concentrations of codopants (Eu 3+ , Bi 3+ ) have been obtained via coprecipitation. An ionic radii mismatch between V 5+ and P 5+ substituents is manifested in broad XRD lines. The sharpening of the XRD lines is observed with increasing bismuth ions concentration in the Eu 3+ codoped YV 0.5 P 0.5 O 4 matrix. The difference in the number of the Stark components for the 5 D 0 → 7 F J transitions indicates changes in the lattice and a number of possible Eu 3+ sites. A thorough, systematic spectroscopic analysis of YV 0.5 P 0.5 O 4 : x mol % Eu 3+ , y mol % Bi 3+ was conducted at room temperature and 5 K. Metal-to-metal energy transfers occurring between Eu 3+ , V 5+ , and Bi 3+ optically active ions have been investigated. Additionally, efficiency of the Bi 3+ -Eu 3+ energy transfer (ET) was calculated.

Multifaceted insight into the cation-disordered self-activated luminescence of Zn3V2O8 compositions for lighting and pigment applications

“…Among various vanadate systems, orthovanadates (M II 3 V 2 O 8 ) exhibit promising luminescence features that arise because of the previously mentioned LMCT luminescence. [23][24][25] Particularly, Zn 3 V 2 O 8 is studied as a significant self-activated yellow light emitter with excitation under n-UV light, good quantum efficiency (QE) and high thermal stability. 26 Qian et al 27 and Li et al 28 previously reported a solid-state synthesized Zn 3 V 2 O 8 phosphor that emits broad yellow emission due to n-UV excitations with QEs B43.6% and B51%, respectively.…”