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http://dx.doi.org/10.46670/JSST.2022.31.4.238

Enhancing Performance of 1-aminopyrene Light-Emitting Diodes via Hybridization with ZnO Quantum Dots  

Choi, Jong Hyun (Center for Opto-electronic Materials and Devices, Korea Institute of Science and Technology)
Kim, Hong Hee (Center for Opto-electronic Materials and Devices, Korea Institute of Science and Technology)
Choi, Won Kook (Center for Opto-electronic Materials and Devices, Korea Institute of Science and Technology)
Publication Information
Journal of Sensor Science and Technology / v.31, no.4, 2022 , pp. 238-243 More about this Journal
Abstract
In this study, a pyrene-core single molecule with amino (-NH2) functional group material was hybridized using ZnO quantum dots (QDs). The suppressed performance of the 1-aminopyrene (1-PyNH2) single molecule as an emissive layer (EML) in light-emitting diodes (LEDs) was exploited by adopting the ZnO@1-PyNH2 core-shell structure. Unlike pristine 1-PyNH2 molecules, the ZnO@1-PyNH2 hybrid QDs formed energy proximity levels that enabled charge transfer. This result can be interpreted as an improvement in surface roughness. The uniform and homogeneous EML alleviates dark-spot degradation. Moreover, LEDs with the ITO/PEDOT:PSS/TFB/EML/TPBi/LiF/Al configuration were fabricated to evaluate the performance of two emissive materials, where pristine-1-PyNH2 molecules and ZnO@1-PyNH2 QDs were used as the EML materials to verify the improvement in electrical characteristics. The ZnO@1-PyNH2 LEDs exhibited blue luminescence at 443 nm (FWHM = 49 nm), with a turn-on voltage of 4 V, maximum luminance of 1500 cd/m2, maximum luminous efficiency of 0.66 cd/A, and power efficiency of 0.41 lm/W.
Keywords
Hybrid light-emitting diodes; 1-aminopyrene; ZnO; Quantum dots;
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