Phosphor Lab Report

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1. INTRODUCTION

1.1 BACKGROUND AND MOTIVATION
In the recent years, an extensive advancement in the field of phosphors has been bloomed by deliberately introducing trivalent rare earth ions (lanthanides) as luminescent centers (dopants) in different host matrices to produce rare earth activated phosphors for lighting applications. A phosphor literally, light bearer is a material capable of absorbing energy and re-emitting it in the form of light (ultra violet, visible or Infrared). In general, Most of the phosphors are usually made up of a host material (matrix) and dopant. The host material is normally an insulator or a semiconductor with a wide band gap and it serves to accommodate the dopant. The host also controls some of the physical properties
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Choice of the materials has been made by considering the environment around the cation which would be substituted by incoming lanthanide ion (activator), phonon energy of the lattice and luminescent character of the host. Materials belonging to the molybdate and tungstate families have a long history of practical applications and have been the object of extensive research over the past century .The continuous interest in these compounds lies in their excellent stability and optical properties (broad absorption and emission band), which form the basis of their wide use as phosphors, laser materials, and scintillation detectors. The mechanochemically assisted SSM reaction route at room temperature is a fast and rapid method and by using this method, fine, chemically homogenous, pure and highly crystalline phase phosphor materials can be prepared in a very short period. Currently, It is the most widely used synthesis technique for production of micro/nanoparticles at industrial scale due to its cost-effectiveness and process versatility for controlled production of particles, especially with regular shape and fine size. To…show more content…
The characteristics of the terbium doped green phosphor materials were analyzed in detail using XRD, Fourier Transform infrared spectroscopy, scanning electron microscope and photoluminescence (PL) in detail.
6. Synthesis and Luminescent properties of Tb3+ activated AWO4 based (A = Ca and Sr) efficient green emitting phosphors
Optically proficient terbium doped alkaline earth metal tungstate nano phosphors (AWO4 [A=Ca, Sr]) with different doping concentrations have been prepared by mechanochemically assisted SSM reaction at room temperature. The prepared phosphors were characterized by the XRD, Fourier Transform Infrared (FTIR) spectroscopy, scanning electron microscope (SEM), Raman spectroscopy, photoluminescence (PL) and diffuse reflectance (DRS) Spectroscopy measurements.
7. Enhanced photoluminescence of Li3Ba2Gd3(MoO4)8:Eu3+ red phosphor synthesized by mechanochemically assisted solid state metathesis reaction method at room

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