Synthesis optimisation and efficiency enhancement in Eu3+ doped barium molybdenum titanate phosphors for w-LED applications

Abstract

Barium Molybdenum Titanate (Ba3MoTiO8) phosphor activated with Eu3+ ions has been synthesized successfully by three different routes such as solid-state reaction method (SSM), combustion method (CMM), and sol-gel combustion method (SGM) to optimize relatively best synthesis technique and temperature of synthesis. X-Ray Diffraction (XRD) patterns have been used to confirm the phase and crystallinity of the as-prepared phosphor. Scanning Electron Microscope (SEM) and Raman spectra have been used to study the morphological behaviorhas and different vibrational bands present in the structure of the titled phosphor respectively. Diffuse Reflectance Spectra (DRS) have been recorded to find out the optical band gap of phosphors. Photoluminescence (PL) spectral features recorded under 393 nm and 465 nm excitation wavelengths reveal an intense red emission at 612 nm corresponding to 5D0→7F2 transition of the doped Eu3+ ions. CMM synthesized sample has shown maximum luminescence intensity out of the three methods and further studies have been carried out by preparing a series of europium ions doped Ba3MoTiO8 phosphor using the CMM technique. The PL decay curves recorded for 612 nm red emission under 393 nm excitation show non-linear double exponential nature with a decrease in an experimental lifetime with an increase in Eu3+ ions concentration in the as-prepared phosphors. All the morphological and photoluminescence studies carried out on the Eu3+ ions doped Ba3MoTiO8 phosphor contemplate the suitability of the as-prepared phosphor for a red component in white light-emitting diode (w-LEDs) applications.