Light-emitting diodes with quantum dot luminophores show promise in the development of next-generation displays, because quantum dot luminophores demonstrate high quantum yields, extremely narrow emission, spectral tunability and high stability, among other beneficial characteristics. However, the inability to achieve size-selective quantum dot patterning by conventional methods hinders the realization of full-colour quantum dot displays. Here, we report the first demonstration of a large-area, full-colour quantum dot display, including in flexible form, using optimized quantum dot films, and with control of the nano-interfaces and carrier behaviour. Printed quantum dot films exhibit excellent morphology, well-ordered quantum dot structure and clearly defined interfaces. These characteristics are achieved through the solvent-free transfer of quantum dot films and the compact structure of the quantum dot networks. Significant enhancements in charge transport/balance in the quantum dot layer improve electroluminescent performance. A method using plasmonic coupling is also suggested to further enhance luminous efficiency. The results suggest routes towards creating large-scale optoelectronic devices in displays, solid-state lighting and photovoltaics.
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The authors thank I. Song and Y.N. Kwon for their help with technical measurement of quantum dot films, S.N. Cha for design support for the transfer printing machine, and K. Kim, J. Kim and K.-W. Kim for GISAXS measurements. Synchrotron GISAXS measurements at Pohang Accelerator Laboratory were supported by the Ministry of Science and Technology and the POSCO Company.
The authors declare no competing financial interests.
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Kim, TH., Cho, KS., Lee, E. et al. Full-colour quantum dot displays fabricated by transfer printing. Nature Photon 5, 176–182 (2011). https://doi.org/10.1038/nphoton.2011.12
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