Controlling Nonradiative Transition Centers in Eu3+ Activated CaSnO3 Nanophosphors through Na+ Co-Doping: Realization of Ultrabright Red Emission along with Higher Thermal Stability

Solid-state lighting, (SSL) and field emission based display (FED) devices collectively encompass a major fraction of contemporary research efforts and thus development of a newer generation of highly luminescent nanophosphors presently defines a critical juncture for further development of this still somewhat-nascent field. However, the low efficiency of red phosphors constitutes a principal bottleneck for commercialization of such devices. Herein, we present a red light emitting highly luminescent Na+ codoped CaSnO3:Eu3+ nanophosphor with an average particle size of 32 nm that has been synthesized by a modified sol gel technique. The resultant nanophosphor exhibits bright red emission under both UV and low voltage electron beam excitations. Furthermore, quantitative assessments of photoluminescence (PL) signatures for Eu3+ doped and Na+ codoped CaSnO3:Eu3+ nanophosphors Conclusively demonstrate that Na+ codoping facilitates an almost 4-fold increase in the luminescence intensity coupled with significant improvement in thermal stability. In addition, charge compensation by incorporation of Na+ leads to an increased order of radiative transition and thereby increases the color purity and lifetime of radiative transition. Obtained results firmly and unandbiguously establish the bright and revolutionary prospects of this new type of nanophosphor in the rapidly emerging field of Solid state lighting and FED devices.