Multifunctional Biguanide Additive Stabilizes Chloride-Rich Quasi-2D Perovskites for Efficient and Stable Pure-Blue
Bufan Yu1, Xingxing Duan1, Zhaohui Xing1
1Institute of Polymer Optoelectronic Materials and Devices, Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China.
ACS Applied Materials & Interfaces
|August 4, 2025
Summary
Phenylbiguanide (PBG) additive engineering overcomes key challenges in blue perovskite light-emitting diodes (PeLEDs). This approach enhances quantum confinement and charge transport, leading to improved color purity and device stability for advanced display applications.
Area of Science:
- Materials Science
- Optoelectronics
- Chemistry
Background:
- Quasi-2D perovskites show promise for light-emitting applications due to quantum confinement.
- Developing stable and efficient blue perovskite light-emitting diodes (PeLEDs) is crucial for display technology.
- Existing methods for blue PeLEDs face trade-offs in quantum confinement, charge transport, spectral purity, and operational stability.
Purpose of the Study:
- To address the challenges in blue PeLEDs using multifunctional additive engineering.
- To improve photoluminescence quantum yield (PLQY), color purity, and device lifetime.
- To develop high-performance blue PeLEDs with enhanced stability and efficiency.
Main Methods:
- Utilized phenylbiguanide (PBG) as a multifunctional additive in quasi-2D perovskites.
- Investigated PBG's role in passivating halide vacancies and suppressing nonradiative recombination.
- Analyzed PBG's effect on halide ion immobilization and crystallization kinetics.
Main Results:
- Achieved a high photoluminescence quantum yield (PLQY) of 76.6% through effective passivation of halide vacancies.
- Reduced emission full width at half maximum (FWHM) to 21 nm for narrow emission at 472 nm.
- Demonstrated pure-blue PeLEDs with an external quantum efficiency (EQE) of 9.32% and significantly enhanced operational stability.
Conclusions:
- Multifunctional additive engineering with PBG offers a viable strategy for high-performance blue PeLEDs.
- PBG effectively mitigates issues related to quantum confinement, charge transport, and operational stability.
- This approach paves the way for advanced display applications utilizing quasi-2D perovskite technology.
