Abstract
In the present work, we report a potential blue-emitting Na2CaSiO4:Eu2+, Ce3+ phosphor with tunable emission for ultraviolet/near ultraviolet (UV/NUV) based white light emitting diodes (WLEDs) and solar applications. In this investigation, blue-emitting Na2CaSiO4:Eu2+, Ce3+ phosphors were successfully synthesized by the sol-gel method. Their phase purity, structure, particle size, morphological behaviour, luminescence and I–V characteristics have been studied. Under 346 nm UV excitation, Na2CaSiO4:Eu2+, Ce3+ phosphor exhibits broad and strong blue emission around 440 nm. The energy transfer from Ce3+ to Eu2+ has been detected in Ce3+ and Eu2+ codoped Na2CaSiO4. The CIE chromaticity coordinates were calculated through the OSRAM SYLVANIA color calculator, which was observed in the blue region for the optimum concentration of Na2CaSiO4:Eu2+, Ce3+ phosphor. The chromaticity coordinate was found in the blue region for synthesized phosphors. In addition, the synthesized material was coated with a commercial silicon solar cell by doctor blade method and it was found that silicon-based solar cell efficiency increased around 16.48% under the solar simulator and 20.89% under direct sunlight. The entire study and results suggested that synthesized materials are potential candidates for WLEDs and solar cell efficiency enhancement.
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