| 초록 |
Semiconductor quantum dots (QDs) are promising luminescent materials due to their size-dependent color tunability and high quantum efficiency. Here, we report light-emitting electrochemical cells (LECs) containing a hybrid QD/polymer layer. The hybrid active layer for the LECs is consisted of QDs (CdSe@CdS@ZnS core-shell-shell QD), conjugated polymer (poly (9-vinylcarbazole), PVK) and electrolyte (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [EMIM][TFSI]). Compared to conventional light-emitting diodes, LECs are driven with the aids of electrochemical process of electrolytes. As a result, light emission with the wavelength corresponding to the optical bandgap of the QDs and efficient charge injection without additional charge injection layers can be achieved. Furthermore, by mixing different sizes of QD into the active layer, we demonstrate that white-light emission can be achieved, which can be exploited in the next-generation flexible lightening sources. |
