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Controllable lasing performance in solution-processed organic-inorganic hybrid perovskites
Tsung Sheng Kao1, Yu-Hsun Chou2, Kuo-Bin Hong1
1Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
Nanoscale
|November 4, 2016
Summary
Researchers controlled perovskite nanocrystal size by adjusting precursor concentrations. This tuning enables tunable excitonic properties and lasing performance in hybrid metal-halide perovskites for optoelectronics.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Solution-processed organic-inorganic perovskites offer high photo-conversion efficiency.
- They hold potential for cost-effective, large-scale optoelectronic device manufacturing.
- Hybrid metal-halide perovskites are actively researched for their unique properties.
Purpose of the Study:
- To demonstrate simple control over perovskite nanocrystal size.
- To achieve tunable excitonic properties and lasing performance.
- To explore the potential of perovskite random lasers for imaging applications.
Main Methods:
- Utilizing a two-step sequential deposition process.
- Manipulating precursor solution concentrations to control nanocrystal size.
- Investigating lasing thresholds and stimulated emission mechanisms.
Main Results:
- Perovskite nanocrystal size was successfully controlled via precursor concentrations.
- Tunable excitonic properties and lasing performance were achieved.
- A low lasing threshold (230 μJ cm-2) was observed, comparable to colloidal quantum dot lasers.
- Efficient stimulated emission resulted from micro-meter scale rugged morphology and grain boundaries.
Conclusions:
- Excitonic properties in perovskites correlate strongly with nanocrystal morphology.
- Perovskite random lasers show promise for low-cost, thin-film lasing devices.
- These lasers are suitable for flexible and speckle-free imaging applications.
