Yellow Emission from Low Coordination Site of Sr2SiO4:Eu2+, Ce3+: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

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Why is it important?

Does not matter what is on your head or your size. Our studies proved that dopant interaction with the neighbor is important in inorganic crystallization. ******************************************************************** Two existing mechanisms propose the role of dopant ions on the crystallization of inorganic materials. (1) dopant’s valence (generally denoted on the element’s top) different from host cation (aliovalent) or (2) dopant size larger than host cation may control the particle growth. Our experimental results with the support of theoretical calculation proved that irrespective of dopant valence and dopant size too, a strong and weak interaction of dopants with neighboring anions in host respectively accumulate the charges on the dopant (cation) and silicate (anion) to produce single crystals and polycrystals. More accumulated charges only near the cation attract the nearby anion needed for further growth resulted in the production of single crystals. Conversely, charges near the anion retard the particle growth due to repulsion. Our results work only when you use large amounts of dopant in Sr2SiO4 using crystal site engineering approach. Use of sensitizer to enhance the yellow emission intensity from low coordination site is another interesting results. This single crystals yellow phosphor may meet the challenges in the production of white LED for high brightness applications for examples automobile headlights, projectors etc., to avoid overheating problems. Our team is pleased to publish this basic research work in pure chemistry journal rather than applied and materials science journals.