Publication date: 15th July 2022
Self-assembled molecule PDINO as electron-transporting layer for CdSe@ZnS based inverted Quantum Dot Light Emitting Diodes
S.Kumari*a,b, E.Martinez-Ferreroa, E.Palomaresa.
a Institute of Chemical Research of Catalonia (ICIQ), Spain.
bUnit of Functional Printing & Embedded Devices, Centre Tecnològic de Catalunya EURECAT, Avda. Ernest Lluch 7, Mataró, E-08302, Spain.
skumari@iciq.es
Abstract:
In the inverted structure of QDLEDs, polyethyleneimine (PEI) is a widely used polymer as an electron transporting material/electron injecting layer. PEI layers are used to balance the charge injection within the device by lowering the cathode contact work function with their intrinsic molecular dipole1. In spite of this, its intrinsic insulativity causes the blocking of the electron injection and hinders the performance of the devices2. Thus, the investigation is devoted to new electron-transporting materials which are suitable for the QDLEDs.
In our work, we have employed a very thin layer < 5 nm of PDINO [2,9-Bis{3-(dimethyloxidoamino) propyl} anthra (2,1,9-def:6,5,10-d'e'f’) diisoquinoline-1,3,8,10(2H,9H)-tetrone] as the Electron transport layer in the inverted structure of red CdSe@ZnS QDLEDs. We have compared the performance and stability of the devices with three different cathodes ITO/PEI, ITO/PDINO, and ITO/PDINO/PEI. We found that the PDINO in the devices increases the operational stability of the devices which contributes towards the preparation of thinner sized QDLEDs.
Keywords: Self-assembled molecule, Quantum Dots, Light emission devices, Materials
References:
[1] Gu W, Liu X, Pi X, Dai X, Zhao S, Yao L, Li D, Jin Y, Xu M, Yang D, Qin G. Silicon-quantum-dot light-emitting diodes with interlayer-enhanced hole transport. IEEE Photonics Journal. 2017, 9(2), 1-10.
[2] Ding K, Chen H, Fan L, Wang B, Huang Z, Zhuang S, Hu B, Wang L. Polyethylenimine insulativity-dominant charge-injection balance for highly efficient inverted quantum dot light-emitting diodes. ACS applied materials & interfaces. 2017, 9(23), 20231-20238.
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