Tarafder, Anal and Chatterjee, Raktima and Das, Abhijit and Maharana, Himanshu Sekhar and Kalyandurg, Annapurna (2025) Phosphor in Glass (PiG) and Glass-ceramic Composite: Future Prospects for High-Performance WLEDs. In: International Conference on Science, Technology, and Applications of Rare Earths (ICSTAR 2025), 21-23 April 2025, Sri Venkateswara University, Tirupati, Andhra Pradesh.

Full text not available from this repository. (Request a copy)

Abstract

The demand for energy-efficient, thermally stable, and spectrally tunable white light-emitting diodes (WLEDs) has led to intensive research into advanced phosphor materials. Commercially, W-LEDs are fabricated by combining GaN-based blue chip with luminescent layer comprising YAG: Ce3+ yellow phosphor in resin (PiR). However, due to their chromatic aberration and poor white light performance, the widened applications of W-LEDs in medical lighting is limited. At present, various fluorescent systems and photoluminescence-tunable strategies are actively being investigated using a variety of techniques. Phosphor-in-glass (PiG) and rare-earth ion (REI) doped glass andglass-ceramic composites have emerged as promising candidates for nextgeneration white light-emitting diodes (W-LEDs), owing to their superior thermal stability, optical performance, and structural reliability compared to conventional phosphor-in-resin (PiR) systems1 . In this study, two complementary approaches are explored to enhance the performance of W-LEDs. At first, Ce³⁺ :Y3Al5O12 (YAG)-based PiG composites were fabricated using ZnO– Na2O–Bi2O3–B2O3–SiO2 borosilicate glass matrix which has low softening point and closely matching refractive index with the index of phosphor. Notably, the fabricated PiG composites exhibited excellent thermal stability, retaining 90% of their luminescence intensity at 175°C, while the conventional phosphor-in-resin (PiR) systems could retain only 70%. Parallelly, Dy3+ - doped BaO–MgO–La2O3–Al2O3–SiO2 glass has been synthesized and converted them to glassceramics composite to havebetter thermal stability, low phonon energy, and good crystal environment for REI. The formation of BaAl2Si2O8 crystalline phases provided a favorable crystalline environment for Dy³⁺ ions, resulting in enhanced white light emission due to yellow at 580 nm (4 F9/2 →  6H13/2) along with blue emissions at 479 nm (4 F9/2 →  6H15/2) under excitation at 351 nm. Photoluminescence intensity was found to be 3–6 times higher in glass-ceramics compared to the precursor glass, accompanied by improved thermal and structural stability. Colorimetric analysis showed emission coordinates leaning toward the warm white region (X= 0.3606, Y=0.3814) indicating suitability for human-centric lighting applications. These two material strategies demonstrate the practical synergy between PiG and REI-doped glass-ceramics in addressing key limitations of commercial W-LEDs, such as poor thermal tolerance and limited color tunability. Their high efficiency, color tunability and durability make them strong candidates for solid-state lighting applications, including those requiring precise CCT control and long-term reliability.

Item Type:	Conference or Workshop Item (Poster)
Subjects:	Glass > Glass Chemistry Glass
Divisions:	Glass
Depositing User:	Ms Upasana Sahu
Date Deposited:	01 Sep 2025 10:28
Last Modified:	01 Sep 2025 10:28
URI:	http://cgcri.csircentral.net/id/eprint/5773

Actions (login required)

View Item