Highly stable cesium lead iodide perovskite quantum dot light-emitting diodes
Chen Zou1, Chun-Ying Huang1,2, Erin M Sanehira1,3
1Department of Electrical Engineering, University of Washington, Seattle, WA 98195, United States of America.
Nanotechnology
|October 18, 2017
Summary
Highly stable red-emitting cesium lead iodide (CsPbI3) quantum dot (QD) light-emitting diodes (LEDs) were developed using an improved purification method, showing promise for efficient and durable optoelectronic applications.
Area of Science:
- Materials Science
- Optoelectronics
- Quantum Dot Technology
Background:
- All-inorganic perovskites, including CsPbBr3 and CsPbI3, show potential for light-emitting applications.
- Red-emitting CsPbI3 perovskites suffer from poor stability, hindering their practical use.
Purpose of the Study:
- To develop a highly stable CsPbI3 quantum dot (QD) light-emitting diode (LED) with red emission.
- To address the stability concerns of CsPbI3 for optoelectronic devices.
Main Methods:
- Fabrication of CsPbI3 QD-LEDs utilizing an improved purification technique.
- Characterization of device performance, including external quantum efficiency (EQE) and operational stability (L70 lifetime).
Main Results:
- The fabricated CsPbI3 QD-LED achieved an EQE of 0.21% at 6 V.
- Demonstrated outstanding operational stability with an L70 lifetime of 16 h at 5 V and 1.5 h at 6 V.
- The device maintained 50% of its initial EL intensity after 500 s at 7 V.
Conclusions:
- CsPbI3 QDs are promising for creating stable red LEDs.
- The findings suggest the potential for electrically pumped perovskite lasers with further optimization.
