Tin-Based Multiple Quantum Well Perovskites for Light-Emitting Diodes with Improved Stability.
Ying Wang1, Renmeng Zou1, Jin Chang1
1Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China.
The Journal of Physical Chemistry Letters
|January 15, 2019
Summary
Tin-based perovskite quantum wells offer a novel solution for stable, efficient, lead-free perovskite light-emitting diodes (PeLEDs). This approach enhances film uniformity and prevents tin oxidation, improving device performance and reproducibility.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Tin-based halide perovskites are promising for non-toxic perovskite light-emitting diodes (PeLEDs).
- Challenges include Sn2+ oxidation and poor film morphology, leading to instability and irreproducibility.
- Lead-based PeLEDs offer high performance but raise environmental concerns.
Purpose of the Study:
- To develop efficient and stable lead-free PeLEDs using tin-based perovskite multiple quantum wells (MQWs).
- To investigate the impact of MQW structure on film morphology and Sn2+ oxidation.
- To evaluate the performance and stability of tin-based MQW PeLEDs.
Main Methods:
- Fabrication of tin-based perovskite multiple quantum wells (MQWs).
- Spectroscopic investigations to analyze film properties and cation stability.
- Device fabrication and characterization of PeLED performance (efficiency, radiance, stability).
Main Results:
- MQW structure facilitates uniform, highly emissive perovskite films.
- MQW structure effectively suppresses Sn2+ oxidation.
- Tin-based MQW PeLEDs achieved 3% external quantum efficiency and 40 W sr-1 m-2 radiance with good reproducibility.
- Devices demonstrated operational stability exceeding 2 hours at 10 mA cm-2.
Conclusions:
- Perovskite MQWs provide a viable strategy for high-performance, stable, lead-free PeLEDs.
- The MQW approach addresses key stability and reproducibility issues in tin-based PeLEDs.
- This work paves the way for environmentally friendly and efficient optoelectronic devices.
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