(From left) Dr Mojun Chen and Dr Ji Tae Kim
Dr Ji Tae Kim, Assistant Professor of the Department of Mechanical Engineering, and his team had worked on a research for the topic “Three-Dimensional Perovskite Nanopixels for Ultrahigh-Resolution Color Displays and Multilevel Anticounterfeiting”. The research was published by Nano Letters on June 14, 2021.
Details of the publication:
Three-Dimensional Perovskite Nanopixels for Ultrahigh-Resolution Color Displays and Multilevel Anticounterfeiting
Mojun Chen, Shiqi Hu, Zhiwen Zhou, Nan Huang, Sanghyeon Lee, Yage Zhang, Rui Cheng, Jihyuk Yang, Zhaoyi Xu, Yu Liu, Heekwon Lee, Xiao Huan, Shien-Ping Feng, Ho Cheung Shum, Barbara Pui Chan, Seung Kwon Seol, Jaeyeon Pyo, and Ji Tae Kim
Article in Nano Letters 2021, 21, 12, 5186–5194
Abstract:
Hybrid perovskites are emerging as a promising, high-performance luminescent material; however, the technological challenges associated with generating high-resolution, free-form perovskite structures remain unresolved, limiting innovation in optoelectronic devices. Here, we report nanoscale three-dimensional (3D) printing of colored perovskite pixels with programmed dimensions, placements, and emission characteristics. Notably, a meniscus comprising femtoliters of ink is used to guide a highly confined, out-of-plane crystallization process, which generates 3D red, green, and blue (RGB) perovskite nanopixels with ultrahigh integration density. We show that the 3D form of these nanopixels enhances their emission brightness without sacrificing their lateral resolution, thereby enabling the fabrication of high-resolution displays with improved brightness. Furthermore, 3D pixels can store and encode additional information into their vertical heights, providing multilevel security against counterfeiting. The proof-of-concept experiments demonstrate the potential of 3D printing to become a platform for the manufacture of smart, high-performance photonic devices without design restrictions.
Link: https://doi.org/10.1021/acs.nanolett.1c01261