Journal
JOURNAL OF LUMINESCENCE
Volume 243, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2021.118623
Keywords
CdS quantum Dots; Eu; CdS co-Doped glass; Eu3+; Eu2+ emission; Energy transfer; Enhanced emission; Chloroborosilicate glass
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Funding
- Center for Research, Technology and Education in Vitreous Materials (CeRTEV, Fundacao de Amparo a Pesquisa do Estado de Sao Paulo), through CEPID program [2013/00793-6]
- Fapesp [2018/04113-8]
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Eu3+ and CdS were singly doped and co-doped into chloroborosilicate glasses. The co-doped glass showed significant enhancements in Eu3+/Eu2+ emissions and exhibited pure white emission.
Eu3+ and CdS were singly doped and co-doped into chloroborosilicate glasses with composition 37.8SiO2-27B2O3-18BaO-3.6K2O-3.6Al2O3-10BaCl2 (mol%), by one-step melt quench technique. The samples were characterized by transmission electron microscopy (TEM), UV-Vis absorption, excitation, and emission spectroscopy. TEM images revealed the presence of CdS quantum dots (QDs) of size 5-20 nm in the CdS-doped glasses. The Eu-doped glass shows characteristic orange emission of Eu3+ at 393 nm excitation, while excitation at 250 and 317 nm revealed the existence of Eu2+ ions. There are strong evidences of energy transfer involving the charge transfer band (CTB) and different energy levels of Eu2+ and Eu3+ ions. The CdS-doped glass showed broad emission bands, originating from various electronic transitions involving defect and trap states in CdS crystalline structure. The emission band in the lower wavelength region, shows a red shift with increasing excitation wavelength, which proves the quantum confinement effect in CdS QDs. Eu/CdS co-doped glasses showed significant enhancements in Eu3+/Eu2+ emissions, up to 20 and 70 times, upon excitations at 393 and 317 nm, respectively, which is considerably higher compared to previously reported similar systems. This enhancement is attributed to a complex energy transfer occurring between Eu2+/Eu3+ and CdS QDs, reported for the first time in a glassy system, especially considering the in-situ growth of the QDs during melt. The co-doped glass also showed pure white emission at 6-7 nm slit width upon 387 nm excitation, which is a novel finding from an Eu/CdS co-doped glass.
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