Color tunable nanocrystalline SrGd2Al2O7:Tb3+ phosphor for solid state lighting

• Published in: Ceramics international 2019-01, Vol.45 (1), p.606-613
• Main Authors: Chahar, Sangeeta, Devi, Rekha, Dalal, Mandeep, Bala, Manju, Dalal, Jyoti, Boora, Priti, Taxak, V.B., Lather, Rajesh, Khatkar, S.P.
• Format: Article
• Language: English
• Subjects: B. X-ray methods; C. Optical properties; Rietveld refinement; SrGd2(1-x)Al2O7:2xTb
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2018.09.215

Color tunable Tb3+ doped SrGd2Al2O7 nanophosphor is synthesized employing a facile and economic urea assisted solution combustion approach. XRD studies confirm the crystallization of single phased SrGd2(1-x)Tb2xAl2O7 nanophosphor in tetragonal lattice with I4/mmm (139) space group. Rietveld refinement is performed over SrGd1.9Tb0.1Al2O7 sample to execute qualitative as well as quantitative phase analysis. TEM analysis confirms the more or less spherical shaped phosphors in nano domain with average particle size ranging 45–80 nm. Photoluminescent investigation reveals that this nanophosphor can be successfully excited by ultraviolet light yielding significant luminescent properties arising due to radiative transitions from 5D3,4 levels to 7Fj levels. Dipole-dipole interactions are solely responsible for the energy transfer causing concentration quenching. Concentration controlled luminescent tendency can be employed to induce chromaticity from blue to green region. Findings of the study proclaim the application of this nanophosphor as one of the green component of tricolor based ultraviolet excited white LEDs.