Bright white light emission from blue emitting carbon dot-coated Dy3+-doped luminescent glasses

Özlem, Beyza and Korkmaz, Ulaş and Erol, Erdinç and Alaş, Melis Özge and Meray, Zeynep and Genç Altürk, Rükan and Çelikbilek Ersundu, Miray and Ersundu, Ali Erçin (2022) Bright white light emission from blue emitting carbon dot-coated Dy3+-doped luminescent glasses. Journal of Alloys and Compounds, 926 . ISSN 0925-8388 (Print) 1873-4669 (Online)

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Dy3+-doped luminescent glasses have received great attention due to their ability to emit white light at a suitable yellow-to-blue intensity ratio. However, achieving bright white light using single Dy3+-doped glasses remains a challenge due to the hypersensitivity of the emission band at 575 nm — usually resulting in intense yellow emission. In this work, we present a novel approach for compensating for the blue emission deficiency of Dy3+ to produce resin-free white light-emitting diodes (WLEDs) by synthesizing two series of Dy3+-doped glasses from tellurite and silicate systems on which blue-emitting carbon dots (BCDs) are spin-coated. The structural, chemical, optical, and luminescence properties of tellurite and silicate glasses are compared and discussed in detail. White light emissions are obtained upon 365-nm excitation for BCD-coated Dy3+-doped tellurite and silicate glasses with color coordinates of (x = 0.31, y = 0.33) and (x = 0.31, y = 0.34) and correlated color temperatures (CCT) of 5518 K and 5316 K, respectively. BCDs coating increases photoluminescence quantum yield (PLQY) values from 3.10 % to 5.62 % and from 20.81 % to 31.49 % for tellurite and silicate glasses, respectively. Ultimately, the findings in this work show the potential of BCD-coated luminescent glasses with excellent luminescent properties to be considered in solid-state lighting applications.
Item Type: Article
Uncontrolled Keywords: Carbon dots; Dy3+; Luminescent glass; Silicate; Tellurite; White light
Divisions: Sabancı University Nanotechnology Research and Application Center
Depositing User: IC-Cataloging
Date Deposited: 04 Sep 2022 16:59
Last Modified: 04 Sep 2022 16:59

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