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- Title
Spectroscopic investigations of Sm doped CaLa(MoO) phosphor for solid state lighting applications.
- Authors
Mahalingam, V.; Syed Gulam Ambia, M.; Thirumalai, J.; Krishnan, R.; Chandramohan, R.
- Abstract
The Sm- doped CaLa(MoO) were successfully synthesized by the solid state reaction method. Indexed powder X-Ray diffraction pattern suggests the scheelite tetragonal crystal structure. Surface Morphology of the sample shows polyhedral morphology and the average particle size estimated from SEM image is 5.5 µm. The energy dispersive X-ray analysis confirms the existence of Ca, La, Mo, O, and Sm elements. The room temperature photoluminescence (PL) emission spectra of Sm- doped CaLa(MoO) with various concentrations upon 404 nm excitation were recorded. The PL emission spectra show three intense emission peaks at 565, 600 and 647 nm were owing to the f-f electronic transitions of 4f electrons of Sm attributed to the transitions G→H, G→H and G→H respectively. Among them, bright orange-red visible emission is obtained due to G→H transition. The decay time and color chromaticity co-ordinates were estimated. From the obtained results, the prepared powder phosphor CaLa(MoO):Sm stands as a suitable candidate for the display and solid state lighting applications.
- Subjects
CHEMICAL synthesis; X-ray diffraction measurement; PHOTOLUMINESCENCE; SCANNING electron microscopy; POLYHEDRAL functions
- Publication
Journal of Materials Science: Materials in Electronics, 2017, Vol 28, Issue 3, p2838
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-016-5867-5