Robust white light emission of UV pumped SrCeO3: xSm3+ perovskites for wLEDs
Author:
Cherlan Kottianmadathil Shilpa1, Seere Valappil Jasira1, Vannadil Puthiyaveetil Veena1, Peroor Umadevi2, Kavukuzhi Meerasahib Nissamudeen1ORCID
Affiliation:
1. School of Pure and Applied Physics , Kannur University , Payyanur Campus, Edat , Kannur , Kerala 670327 , India 2. Department of Nanoscience and Nanotechnology , Kannur University , Payyanur Campus, Edat , Kannur , Kerala 670327 , India
Abstract
Abstract
Single phased white light emitting phosphors are more ideal for fabricating white LEDs due to higher stability and color reproducibility. Herein, we report a new white light emitting phosphor, SrCeO3: xSm3+ (x = 1 wt%, 2 wt%, 3 wt%) from a blue light emitting phosphor, SrCeO3 using an efficient, low energy consuming fuel excess gel combustion technique. From the XRD crystallographic investigation, all the synthesised samples have orthorhombic structure with space group Pnma. A broad absorption band in the UV–visible spectra around 350 nm occurs due to the efficient energy transfer from Ce4+ to Sm3+ ion. PL spectra analysis at UV excitations 280 nm and 406 nm, consist of 4f-Sm3+ transitions 4G5/2-6H5/2, 4G5/2-6H7/2, 4G5/2-6H9/2 and charge transfer band from O2− to Ce4+. The energy transfer between activator ions occurs through dipole–dipole interaction, owing to concentration quenching after 2 wt% Sm3+ and the optimised dopant concentration was 2 wt%. SrCe0.98Sm0.02O3 showed mixed blue-yellow-orange-red emission, owing near white light under both excitations. PL data were utilised to find the color parameters and found high color rendering index (CRI ∼ 84) for optimised sample at 406 nm excitation. SEM analysis reveals that the optimised sample exhibit dense ensembled morphology with well-defined grain boundaries and uniformity with average grain size ∼1.24 μm. Further, the elemental composition was confirmed using EDS analysis. From the digital photographs of samples, it is foreseen that, SrCe0.98Sm0.02O3 pumped using near UV LED chip can be used for commercial white light generation.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry,General Physics and Astronomy,Mathematical Physics
Reference36 articles.
1. R. Cao, J. Lin, B. Lan, et al.., “Luminescence properties, tunable emission and energy transfer of Na3Sc2(PO4)3: Sm3+, Bi3+ phosphors,” J. Mol. Struct., vol. 1282, p. 135221, 2023. https://doi.org/10.1016/j.molstruc.2023.135221. 2. L. Chen, C. I. Chu, and R. S. Liu, “Improvement of emission efficiency and color rendering of high-power LED by controlling size of phosphor particles and utilization of different phosphors,” Microelectron. Reliab., vol. 52, p. 900, 2012. https://doi.org/10.1016/j.microrel.2011.07.058. 3. R. Cao, Z. Jiang, T. Chen, et al.., “Study on the luminescence properties and energy transfer of Na4CaSi3O9:Ce3+, Sm3+ phosphor,” J. Lumin., vol. 243, p. 118618, 2022. https://doi.org/10.1016/j.jlumin.2021.118618. 4. L. Chen, M. Fei, Z. Zhang, et al.., “Understanding the local and electronic structures toward enhanced thermal stable luminescence of CaAlSiN3:Eu2+,” Chem. Mater., vol. 28, p. 5505, 2016. https://doi.org/10.1021/acs.chemmater.6b02121. 5. L. Chen, X. Chen, F. Liu, et al.., “Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs,” Sci. Rep., vol. 5, p. 11514, 2015. https://doi.org/10.1038/srep11514.
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