Adroit low-temperature synthesis and origin of blue–yellow–red emission in activated La2-xDyxMgTiO6 novel perovskite phosphor for WLED

• Published in: Journal of materials science. Materials in electronics 2023-04, Vol.34 (10), p.870, Article 870
• Main Authors: Veena, V. P., Shilpa, C. K., Jasira, S. V., Vini, K., Nissamudeen, K. M.
• Format: Article
• Language: English
• Subjects: Acids; Characterization and Evaluation of Materials; Chemistry and Materials Science; Citric acid; Combustion; Comparative studies; Dysprosium; Emission spectra; Heat; Heat treatment; High temperature; Lamps; Light; Light emission; Lighting; Low temperature; Materials Science; Microscopy; Optical and Electronic Materials; Optical properties; Perovskites; Phosphors; Photoluminescence; Quantum efficiency; Radiation; Solid state; Synthesis; White light
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-023-10262-8

A series of dysprosium (Dy 3+ ) doped double perovskite nano phosphor La 2 MgTiO 6 is synthesised by low-temperature facile combustion method using citric acid. When excited under UV-blue radiation, Dy 3+ shows bright yellow emission at 574 nm ( 4 F 9/2  →  6 H 13/2 ), along with blue emission at 480 nm ( 4 F 9/2  →  6 H 15/2 ) and red emission at 670 nm ( 4 F 9/2  →  6 H 11/2 ). La 2 MgTiO 6 is attempted to prepare by combustion method (c-LMT) for the first time, and the prime method is compared with conventional solid-state reaction (s-LMT), a comparative study of the best technique for the synthesis of LMT is established. Experimental results indicate that the adroit synthesis temperature for c-LMT:Dy 3+ is only 1173 K with heat treatment of 4 h, while the traditional solid-state method requires 1673 K for 8–12 h. Additionally, c-LMT shows enhanced ideal white light emission with CIE coordinates (0.341, 0.376) and photoluminescence quantum efficiency of 89.68%.