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Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
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Ultrastable, cationic three-dimensional lead bromide frameworks that intrinsically emit broadband white-light
Chengdong Peng1, Zewen Zhuang1, Huimin Yang1
1Shanghai Key Laboratory of Chemical Assessment and Sustainability , School of Chemical Science and Engineering , Tongji University , 1239 Siping Rd. , Shanghai 200092 , P. R. China .
Chemical Science
|April 21, 2018
Summary
Researchers developed novel, stable white-light emitting materials from inorganic cationic lead bromide frameworks. These materials offer high efficiency and durability, unlike sensitive perovskites, paving the way for advanced light-emitting applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photophysics
Background:
- Organolead halide perovskites are promising but suffer from instability.
- Development of stable, single-component white-light emitters is a significant challenge.
- Purely inorganic metal halide frameworks with unique topologies are underexplored.
Purpose of the Study:
- To synthesize and characterize novel inorganic cationic lead bromide frameworks.
- To investigate their intrinsic broadband white-light emission properties.
- To evaluate their chemical and photostability for potential applications.
Main Methods:
- Synthesis of two novel 3D cationic lead bromide frameworks.
- Photoluminescence and absorption spectroscopy (variable temperature).
- X-ray crystallography for structural analysis.
- Chemical stability tests (pH, boiling water).
- Long-term UV-irradiation stability tests.
Main Results:
- Successfully synthesized two purely inorganic 3D cationic lead bromide frameworks with distorted PbII centers.
- Achieved broadband white-light emission with external quantum efficiency up to 5.6% and correlated color temperature of 5727 K.
- Demonstrated exceptional chemical inertness and remarkable photostability (undiminished emission after 30 days UV exposure).
- Mechanistic studies revealed broadband emission originates from self-trapped excited states via electron-vibrational coupling.
Conclusions:
- The synthesized cationic lead bromide frameworks represent a new class of ultrastable, single-component white-light emitters.
- Their robustness and tunable structure offer significant advantages over existing materials.
- These findings open new avenues for designing highly photostable hybrid bulk emitters.
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