While many think of perovskite for  solar cells, there are significant opportunities for their use in  lighting and displays. A research team at Southern University of Science  and Technology (SUSTech) has been working relentlessly to make new  progress in the perovskite enhanced displays.

 Perovskite materials are ideal candidates for display and lighting  because of their excellent optical properties, tunable bandgap, and  efficient luminous properties. However, they lack the stability for  commercial development. Considerable research has been put into  perovskite materials to improve the displays on a variety of everyday  items.

Professor Xiaowei Sun and Associate Professor Kai Wang (both Electrical and Electronic Engineering) have brought their research teams together to publish two significant papers in high-impact academic journals Advanced Functional Materials (IF = 15.6) and Advanced Optical Materials (IF = 7.1)

The paper published in Advanced Functional Materials was titled, “Highly Luminescent and Stable Green Quasi‐2D Perovskite‐Embedded Polymer Sheets by Inkjet Printing.”  It proposed an inkjet printing strategy for in-situ generating quasi-2D  perovskite on different polymer substrates. This unique strategy would  protect the perovskite layer from erosion while improving its stability  and increasing its luminescence.

Figure 1. In-situ inkjet printing of  quasi-2D perovskite uniform pixels and patterns, and their water  stability and chemical solution stability

The high-precision pattern composite material film, realized by  in-situ inkjet printing quasi-2D perovskite technology, offers great  promise in flat panel displays. It should reduce the cost of light  conversion films in 4K and 8K display technologies significantly.

Visiting student from Jilin University, Siqi Jia was the first author of the paper. The co-corresponding authors of the paper were Xiao Wei Sun, Kai Wang,  and Guangyu Li (Jilin University). SUSTech and Jilin University are the  corresponding units. The other contributing unit was the Shenzhen Planck Innovation Technology Co. Ltd.

The authors would like to acknowledge support from the Ministry of  Science and Technology of China, National Natural Science Foundation of  China, Guangdong Province Key R&D Program: Micro-LED Display and  Ultra-high Brightness Micro-display Technology, Environmentally Friendly  Quantum Dots Luminescent Materials, Guangdong University Key Laboratory  for Advanced Quantum Dot Displays and Lighting, Distinguished Young  Scholar of Natural Science Foundation of Guangdong, Shenzhen Key  Laboratory for Advanced Quantum Dot Displays and Lighting, Shenzhen  Peacock Team Project, Shenzhen Innovation Project, and the High-Level  University Fund of Guangdong Province.

Link to the paper: https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201910817

The paper published in “Advanced Optical Materials” was titled “Facile In Situ Fabrication of Cs₄PbBr₆/CsPbBr₃ Nanocomposite Containing Polymer Films for Ultrawide Color Gamut Displays.” In this paper, the research group proposed a simple and effective method for the preparation of a Cs₄PbBr₆/CsPbBr₃  perovskite nanocrystal film. The researchers prepared a polymer  composite film that has a high conversion efficiency of light while  having a low deterioration rate due to the dual protection by Cs₄PbBr₆ and the polymer matrix.

Figure 2. (a) Schematic diagram of the  backlight structure of the mobile phone-based on the perovskite  composite film; (b, c) the fluorescence spectrum of the original mobile  phone screen and the new screen; (d) color gamut; (e, f) the original  mobile phone screen and A comparison of the color effects of the new  screen.

Compared to quantum dot films, the perovskite nanocrystal films  provide more vibrant color details for smartphones, particularly in the  green spectrum with a narrow full width at half maximum of 19nm (Figure  2).

 This paper in Advanced Optical Materials has successfully  demonstrated the outstanding advantages of high-performance perovskite  composite films in wide-color displays. It provides significant support  for commercial applications for these films.

Research Assistant Xiang Li was the first author of the paper. The  co-corresponding authors were Professor Xiao Wei Sun and Associate  Professor Kai Wang. Other contributions came from Shenzhen Planck Innovation Technology Co. Ltd., the National University of Singapore, and the University of Hong Kong.

This work was supported by the National Key Research and Development  Program of China administrated by the Ministry of Science and Technology  of China, National Natural Science Foundation of China, Guangdong  Province Key R&D Program: Micro‐LED Display and Ultra‐high  Brightness Micro‐display Technology; Environmentally Friendly Quantum  Dots Luminescent Materials, Guangdong University Key Laboratory for  Advanced Quantum Dot Displays and Lighting, Distinguished Young Scholar  of Natural Science Foundation of Guangdong, High-Level University of  Guangdong Province, Shenzhen Key Laboratory for Advanced Quantum Dot  Displays and Lighting, Shenzhen Peacock Team Project, and Shenzhen  Innovation Project.

Link to the paper: https://onlinelibrary.wiley.com/doi/full/10.1002/adom.202000232