Abstract
We obtain spectrally narrow (FWHM < 40 nm) electroluminescence from nearly monodisperse CdSe nanocrystallites (quantum dots) incorporated into thin films of polyvinyl carbazole (PVK) and an oxadiazole derivative (PBD) sandwiched between aluminum and ITO electrodes. The electroluminescence and photoluminescence spectra are nearly identical at room temperature and are tunable from ~530 nm to ~650 nm by varying the size of the dots. Voltage studies at 77K indicate that while only the dots electroluminesce at the lower voltages, both the dots and the PVK matrix electroluminesce at higher applied voltages. Variable temperature studies indicate that the electroluminescence efficiency increases substantially as the films are cooled down to cryogenic temperatures.
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Dabbousi, B.O., Onitsuka, O., Rubner, M.F. et al. Size Dependent Electroluminescence from CdSe Nanocrystallites (Quantum Dots). MRS Online Proceedings Library 358, 707 (1994). https://doi.org/10.1557/PROC-358-707
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DOI: https://doi.org/10.1557/PROC-358-707