Balanced carrier injection of quantum dots light-emitting diodes: The case of interface barrier of bilayer ZnO electron transport layer

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Abstract

Unbalanced carrier injection is one of the most important reasons for the efficiency roll-off in quantum dot light-emitting diodes. Reducing the electron injection can effectively balance the carrier transport and improve the optoelectronic performance of the device. In this work, a bilayer ZnO electron transport layer was fabricated by twice spin-coating and annealing methods. More than 60% of electrons are effectively blocked by the ZnO interface barrier compared with the standard device, resulting in increasing the maximum luminance of the device from 25 390 to 48 220 cd m-2 and the current efficiency from 1.5 to 3.2 cd A-1.

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Tu, Y., Wang, S., Zhang, Y., Chen, L., Fang, Y., & Du, Z. (2018). Balanced carrier injection of quantum dots light-emitting diodes: The case of interface barrier of bilayer ZnO electron transport layer. Nanotechnology, 29(48). https://doi.org/10.1088/1361-6528/aae0b8

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