Das, Subrata and P. , Ranjith and Tarafder, Anal and Das, Abhijit (2025) Phosphor in Glass Pellets Based on a Broadband Emitting Garnet Phosphor and Borosilicate Glass Composite for Thermally Stable High Performance White LEDs. Journal of Alloys and Compounds, 1044 (184373). ISSN 0925-8388
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In this study, we successfully developed a new class of thermally stable, blue-light-excitable phosphor-in-glass (PiG) composites based on broadband reddish-yellow-emitting Lu₁.₉₅Mg₂Al₂Si₂O₁₂: 0.05Ce³ ⁺ (LMAS: Ce) phosphor powders embedded in a Na₂O-BaO-ZnO-Bi₂O₃-B₂O₃-SiO₂ (NBZBB) bismuth borosilicate glass matrix. The structural and luminescent properties of both the phosphor powders and their corresponding PiG composites have been systematically compared and discussed in details. The photoluminescence (PL) spectrum of LMAS: Ce exhibited a red-shifted emission compared to Y₃Al₅O₁₂: Ce³ ⁺ (YAG: Ce), centered at 580 nm with a full width at half maximum of ∼146 nm. Meanwhile, the electroluminescence (EL) spectrum of the WLED fabricated using LMAS: Ce phosphor and a 460 nm blue InGaN LED (operated at a forward-bias current of 20 mA) exhibited white emission with a color rendering index (CRI) of ∼80 and a correlated color temperature (CCT) of ∼3531 K. However, the thermal stability of the LMAS: Ce phosphor was found to be limited, retaining only 75 % of its initial emission intensity at 150 °C. Eventually, the 5 % LMAS: Ce PiG system exhibited much higher emission stability ∼98 % at 150 °C, than that of LMAS: Ce phosphor powders ∼75 % due to the glass encapsulations. Meanwhile, the other photoluminescent properties of the LMAS:Ce PiG remained similar to those of its powder form. By combining the as-fabricated PiG with high-power blue chip-on-board, warm white light was realized with superior chromaticity coordinates of (0.41, 0.40), low CCT ∼3401 K, and high CRI ∼86. The EL of the 5 wt% LMAS: Ce PiG showed a consistent increase in intensity with increasing LED pump power, without any saturation effect. Additionally, the chromaticity coordinates remained nearly constant across pump powers ranging from 0.9 W to 3.6 W. The results indicated that the developed single-component phosphor in glass (PiG) can be used as a resin-free light converter for high-power white LEDs.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Garnet phosphors, Borosilicate glass matrix, Phosphor-in-glass Composites, Resin free, Warm white light |
| Subjects: | Glass > Glass Chemistry Glass |
| Divisions: | Glass |
| Depositing User: | Ms Upasana Sahu |
| Date Deposited: | 12 May 2026 17:02 |
| Last Modified: | 12 May 2026 17:02 |
| URI: | https://cgcri.csircentral.net/id/eprint/5804 |
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