A benign approach for tailoring the photometric properties and Judd-Ofelt analysis of LaAlO3:Sm3+ nanophosphors for thermal sensor and WLED applications
| Autor: | T. Manohar, H.B. Premkumar, Ramachandra Naik, H.P. Nagaswarupa, K.S. Anantharaju, H. Nagabhushana, K.M. Girish, S.C. Prashantha |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Materials science Phosphor 02 engineering and technology Color temperature 010402 general chemistry 01 natural sciences chemistry.chemical_compound Lanthanum aluminate Materials Chemistry Emission spectrum Electrical and Electronic Engineering Chromaticity Instrumentation business.industry Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Optoelectronics Quantum efficiency 0210 nano-technology business Luminescence |
| Zdroj: | Sensors and Actuators B: Chemical. 243:1057-1066 |
| ISSN: | 0925-4005 |
| Popis: | Sm 3+ doped (1–9 mol%) Lanthanum aluminate (LaAlO 3 ) nanophosphor was prepared by solution combustion synthesis and characterized by photoluminescence (PL), powder X-ray diffraction (PXRD), UV–vis (UV-vis), scanning and transmission electron microscopy (SEM and TEM). PL excitation and emission spectra, quantum efficiency, luminescence life time were studied to investigate the luminescence properties of LaAlO 3 :Sm 3+ nanophosphor, effectively excited by near UV wavelength 406 nm. The combination of different coloured emissions in visible region presents a desired white light which leads to the WLED application. The chromaticity coordinates of the optimized concentration of Sm 3+ was estimated to be (0.3684, 0.4066) and the corresponding correlated color temperature (CCT) was found to be ∼4485 K which favors in warm white light emissive display applications. The luminescence quantum efficiency was calculated from the emission spectra using Judd–Ofelt (J-O) theory. From the analysis the estimated branching ratio (∼56%) was greater than 50%, as a result the phosphor was highly suitable for display devices. The present phosphor was highly useful as thermal sensor in the temperature interval between 100 to 400 °C as estimated from decay time measurements. |
| Databáze: | OpenAIRE |
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