Journal
ACS ENERGY LETTERS
Volume 4, Issue 11, Pages 2731-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b02032
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Funding
- Energy Materials and Surface Sciences Unit of the Okinawa Institute of Science and Technology Graduate University
- GIST Proof of Concept (POC) Program
- GIST RAMP
- D Cluster Research Program
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A series of challenging issues such as field-driven spectral drift for the CsPbClxBr3-x system and mixed phases in quasi-two-dimensional structures still exist when devising blue-emitting perovskites. In this Letter, the CsPbBr3 quantum-dot (QD) system is proposed to overcome these challenges. However, to date, the CsPbBr3 QD films with tunable colors from green to blue still cannot be achieved using existing methods. Herein, a simple one-step spin-coating route incorporated with efficient ligand passivation is developed to realize this goal. The size restriction of CsPbBr3 QDs is enabled by a diammonium ligand, propane-1,3-diammonium bromide (PDAB). A mixed-ligand system of phenethylammonium bromide (PEAB) with PDAB is further explored to enhance their optical performance. The CsPbBr3 QDs experience a second growth process upon controlled air exposure, which is utilized to realize their size control and emission wavelength tunability. The CsPbBr3 QD-based devices exhibit no spectral drift in electroluminescence under voltage bias.
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