Combustion Synthesis and Energy Transfer Mechanism of Bi³⁺ → Gd³⁺ and Pr³⁺ → Gd³⁺ in YBO₃

Abstract

YBO₃:Gd³⁺, YBO₃:Gd³⁺, Bi³⁺, and YBO₃:Gd³⁺, Pr³⁺ phosphors were synthesized by the combustion synthesis method. The phase analysis of all synthesized materials was determined using powder X-ray diffraction (XRD). Photoluminescence properties and concentration quenching of these phosphors were systematically investigated. All the samples show the characteristic narrow band UVB emission of Gd³⁺ ions (⁶P_J → ⁸S_7/2). The maximum intensity of luminescence in synthesized materials was investigated. The energy transfer mechanism was studied using Bi³⁺ and Pr³⁺ as sensitizers, and it is observed that as compared to Bi³⁺, Pr³⁺ effectively transfers its energy to Gd³⁺. The Stokes shifts of YBO₃:Gd³⁺, YBO₃:Gd³⁺–Bi³⁺, and YBO₃:Gd³⁺–Pr³⁺ phosphors were calculated to be 4181 cm⁻¹, 6410 cm⁻¹, and 7949 cm⁻¹, respectively.

Keywords:

• Combustion synthesis
• Energy transfer mechanism
• Inorganic borate
• Luminescence