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Structural Engineering for Efficient Transparent Vacuum-Deposited Perovskite Light-Emitting Diodes toward Intelligent
Xiang Zhang1,2, Jinghui Li1,3, Peipei Du4
1Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
ACS Applied Materials & Interfaces
|November 27, 2024
Summary
Researchers developed a new vacuum deposition method for perovskite light-emitting diodes (PeLEDs), significantly boosting their efficiency and enabling bifunctional intelligent displays for imaging and heart rate monitoring.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Perovskite light-emitting diodes (PeLEDs) are key for next-generation intelligent displays.
- Vacuum deposition offers high manufacturability and pixelation for PeLED integration.
- Challenges remain in achieving controlled grain morphology and crystal quality in vacuum-deposited perovskites.
Purpose of the Study:
- To develop an improved vacuum deposition strategy for high-performance PeLEDs.
- To enable the fabrication of efficient, vacuum-deposited transparent PeLEDs.
- To integrate these PeLEDs into a bifunctional intelligent display device.
Main Methods:
- A trisource coevaporation strategy was employed to introduce MABr.
- This formed a CsPbBr3 structure with enhanced carrier confinement and reduced defects.
- Optimized Ag:Mg electrodes replaced Al in transparent PeLEDs.
Main Results:
- The proposed method achieved a nearly 10-fold increase in external quantum efficiency (EQE) compared to untreated devices.
- The first vacuum-deposited transparent PeLEDs with double-sided emission were realized, reaching a maximum EQE of 7.6%.
- These PeLEDs were integrated into a bifunctional device demonstrating patterned emission and accurate heart rate detection.
Conclusions:
- The trisource coevaporation strategy effectively improves vacuum-deposited PeLED performance.
- Vacuum-deposited transparent PeLEDs are viable for advanced display applications.
- Bifunctional intelligent displays combining imaging and sensing capabilities are achievable.
