Enhancement of radiative transitions in Sm3+ activated CaTiO3 nanophosphor by modulating co-activator concentration
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In present era, rare earth doped nanophosphors are the key architecture in the development of white light-emitting diodes (WLEDs) and their performance has become a major topic of interest among the researchers. Still, the deficiency of orange phosphor has become a barrier for the commercialization of the WLED. In this work, single phase intense orange light emitting Na+ co-activated CaTiO3 (CTO):Sm3+ nanophosphor is synthesized via modified sol–gel method with an average particle size of 60 nm. The synthesized nanophosphor strongly exhibits bright orange emission under 408 nm excitation. Comparative photoluminescence (PL) analysis of CTO:Sm3+ and Na+ co-doped CTO:Sm3+ nanophosphors irrefutably reveals that incorporation of Na+ facilitates almost threefold increase in the luminescence intensity along with significant improvement in thermal stability. Obtained results conclusively suggest that strong orange emitting Na+ co-activated Sm3+ doped CTO nanophosphor could be a potential candidate for use in blue light chip based warm WLED and others lighting device applications.
The authors would like to acknowledge the Principal Maharaj (Swami Shastrajnananda) and Vice Principal Maharaj (Swami Ekachittananda) of the Ramakrishna Mission Vidyamandira for their keen interest in the work. The authors would also like to acknowledge Department of Science & Technology (DST), Govt. of India and Department of Higher Education, Govt. of West Bengal for financial assistance. One of the authors Karamjyoti Panigrahi would like to acknowledge Council of Scientific & Industrial Research (CSIR) for awarding him CSIR-Direct SRF award during the tenure of this work. The authors would like to express the gratitude to Mr. Soumyadip Mondal, Mr. Jotypriya Sarkar, Mr. Rabi Ranjan Roy, Mr. Shyamal Murmu and Mr. Amal Gain for their technical assistance.
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