Synthesis of Anisotropic Perovskite Nanocrystals with Polarized Emission for Light Emitting Diodes
Project: Research
Researcher(s)
- Andrey ROGACH (Principal Investigator / Project Coordinator)Department of Materials Science and Engineering
- He HUANG (Co-Investigator)Department of Materials Science and Engineering
- Stephen Vincent KERSHAW (Co-Investigator)Department of Materials Science and Engineering
- Julian SCHNEIDER (Co-Investigator)Department of Materials Science and Engineering
- Yuan XIONG (Co-Investigator)Department of ChemistryDepartment of Materials Science and Engineering
- Haizheng Zhong (Co-Investigator)
Description
In the last few years, lead halide perovskites as a class of materials have attracted a great deal of interest for solar and other applications. Perovskites can be grown in solution as nanocrystals, and in this form they may offer considerable advantages for applications such as color display devices. Right from the outset perovskite QDs have shown very attractive performance: photoluminescence quantum yields have been as high as 90-95% whilst the emission spectral widths have been narrow, which is helpful for the rendering of saturated colors and in tri-color liquid crystal displays (LCDs) allows a wide color gamut to be covered. As an LCD back panel illumination source, perovskites could be driven either as down converters, illuminated themselves by short wavelength conventional LED arrays, or as directly driven LEDs in their own right. The later would be highly desirable for mobile applications as it will lead to thinner, lighter weight displays. An additional and critical performance metric for mobile and battery operated devices is the power efficiency of backlit displays. Since the LCD part of the displays requires polarized light, an inherently polarized back panel is highly desirable as it would allow all of the light output to be used rather than discarding over 50% of the emission by passing it through a sheet polarizer. Elongated, anisotropic nanocrystals can emit polarized light when they are aligned in parallel. The aim of this project is to bring all of the potential advantages of anisotropic perovskite nanocrystals together in order to demonstrate two classes of polarized back panel emitters – one based on down-conversion and the other based on direct electrical excitation. This will entail maximization of the polarization anisotropy ratio, both via growth of elongated QDs and subsequent alignment of the particle long axes in the back panel emitter structures, whilst simultaneously maintaining the high emission quantum yield and color purity of the materials.Detail(s)
Project number | 9054022 |
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Grant type | NSFC |
Status | Finished |
Effective start/end date | 1/01/18 → 18/02/22 |