Polyhedral Oligomeric Silsesquioxane Enhances the Brightness of Perovskite Nanocrystal-Based Green Light-Emitting Devices
| Autor: | Andrei S. Susha, Stephen V. Kershaw, Wallace C. H. Choy, Hong Lin, He Huang, Andrey L. Rogach |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
business.industry Nanotechnology 02 engineering and technology Green-light Electroluminescence 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Silsesquioxane 0104 chemical sciences Active layer law.invention chemistry.chemical_compound Nanocrystal chemistry law Optoelectronics General Materials Science Quantum efficiency Physical and Theoretical Chemistry 0210 nano-technology business Light-emitting diode Perovskite (structure) |
| Zdroj: | The Journal of Physical Chemistry Letters. 7:4398-4404 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.6b02224 |
| Popis: | The beneficial role of the insulating material polyhedral oligomeric silsesquioxane (POSS) as a solution additive or an additional hole-blocking layer to enhance the performance of electroluminescent green light-emitting devices (LEDs) based on CsPbBr3 perovskite nanocrystals is demonstrated. POSS improves the surface coverage and the morphological features of the films deposited either from supernatant or suspension of perovskite nanocrystals. The external quantum efficiency and the luminance efficiency of LEDs with an additional POSS layer reach 0.35% and 1.20 cd/A, respectively, constituting a more than 17-fold enhancement to the reference devices without POSS; the LED peak luminance reaches 2983 cd/m2, and the device stability is improved. The POSS acts as a hole-blocking layer between the perovskite nanocrystals and TPBi, keeping both electrons and holes located within the active layer for an efficient recombination. |
| Databáze: | OpenAIRE |
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