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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
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Vacuum-Drying Processed Micrometer-Thick Stable CsPbBr3 Perovskite Films with Efficient Blue-To-Green Photoconversion
Yongming Yin1,2, Muhammad Umair Ali3, Ming Liu1
1School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 14, 2019
Summary
Researchers developed thick cesium lead bromide (CsPbBr3) perovskite films for efficient color conversion. These films demonstrate stable green light emission from blue light, crucial for advanced display technologies.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Metal halide perovskites offer unique optoelectronic properties and cost-effective fabrication.
- Perovskites are explored as color-conversion layers (CCLs) for full-color displays, converting blue light to other colors.
- A significant challenge is fabricating sufficiently thick perovskite films for complete color conversion.
Purpose of the Study:
- To develop micrometer-level thick perovskite films for efficient color conversion.
- To investigate the performance of these films as color-conversion layers for displays.
- To assess the stability and potential applications of these materials in optoelectronic devices.
Main Methods:
- Fabrication of micrometer-level thick cesium lead bromide (CsPbBr3) perovskite films using a vacuum drying method.
- Characterization of the films' structural and optical properties.
- Testing the photoconversion efficiency and luminance of the green emission from blue light excitation.
Main Results:
- Successfully fabricated CsPbBr3 perovskite films with thicknesses up to 3.8 µm.
- Achieved efficient green photoconversion from blue light (463 nm) with a brightness of 200 cd m⁻² at a back luminance of 1000 cd m⁻².
- Demonstrated excellent stability, with only a 2% brightness decay after 18 days in ambient conditions.
Conclusions:
- Micrometer-level thick CsPbBr3 perovskite films can be fabricated via vacuum drying for efficient color conversion.
- These films show promising performance and stability for application as color-conversion layers in full-color displays.
- The developed materials offer a viable route towards advanced display technologies utilizing perovskite optoelectronics.
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