Chatterjee, Raktima and Tarafder, Anal (2025) Dy3+-doped Nanocrystalline BaAl2Si2O8 Glass-ceramic Phosphor: A Potential Material for W-LEDs. In: International Congress on Glass (ICG 2025), 20-24 January, 2025, Biswa Bangla Convention Centre, Kolkata, West Bengal.

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Abstract

In recent years, white light-emitting diodes (W-LEDs), have attracted significant attention due to their environment benefits, long lifetime, low energy consumption and magnificent applications for displays and lighting. Presently, the commercial W-LEDs are fabricated by combining GaN-based blue chips with YAG: Ce yellow phosphors. However, due to their chromatic aberration and poor white light performance, the expansion applications of W-LEDs in medical lighting is limited. Compared to conventional phosphors used for W-LEDs, Rare-earth ions (REI) doped glass- ceramics (GCs) possess excellent characters from both glasses and crystals, such as better thermal stability, lower production cost, low phonon energy, defect free and good crystal environment for REI.In this paper, Dy-doped glass and glass ceramics containing BaAl2Si2O3 nanophosphor in BaO-MgO-Al2O3-La2O3-SiO2 (BMALS) system has been synthesized via conventional melt quenching method followed by controlled crystallization at 880°C at different heating time. The prepared samples were characterized using X-Ray Diffraction (XRD), Differential Scanning Calorimeter (DSC), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray studies (EDX), and Photoluminescence (PL). The composition of the crystallized phases, average crystallite sizewith increase in heat-treatment time were studied by X-ray diffraction and energy dispersive X-ray analysis, respectively. The luminescence Properties of Dy in the host matrix were systematically studied using excitation and emission spectrum profile. The results showed a predominant yellow emission at 580 nm (F92 H132) along with their shoulder blue emission at 479 nm (F9/2 H15/2) under excitation at 351 nm, indicating that the Dy³ ions occupied lattice sites with low inversion symmetry. Commission International de l'Eclairage (CIE) was used to study the chromatic nature of the GC phosphors. The calculated values of chromaticity coordinates were found to be located towards warm white light region. The prepared materials may find promising applications in white LEDs.

Item Type:	Conference or Workshop Item (Poster)
Subjects:	Ceramic-Metal Systems Glass
Divisions:	Glass
Depositing User:	Ms Upasana Sahu
Date Deposited:	01 Sep 2025 10:26
Last Modified:	01 Sep 2025 10:26
URI:	http://cgcri.csircentral.net/id/eprint/5772

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