Highly Efficient Light-Emitting Diodes of Colloidal Metal-Halide Perovskite Nanocrystals beyond Quantum Size
| Autor: | Aditya Sadhanala, Young-Hoon Kim, Sungan Do, Tae-Woo Lee, Sang Hyuk Im, Young Tae Kim, Chan Gyung Park, Himchan Cho, Shi-Woo Rhee, Richard H. Friend, Christoph Wolf, Woosung Kwon |
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| Přispěvatelé: | Sadhanala, Aditya [0000-0003-2832-4894], Friend, Richard [0000-0001-6565-6308], Apollo - University of Cambridge Repository |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Photoluminescence light-emitting diodes General Physics and Astronomy 02 engineering and technology Electroluminescence 010402 general chemistry 01 natural sciences law.invention electroluminescence hole injection layer PEDOT:PSS law quantum size General Materials Science Perovskite (structure) business.industry General Engineering 021001 nanoscience & nanotechnology 0104 chemical sciences Nanocrystal Quantum dot perovskite nanocrystal Optoelectronics Quantum efficiency 0210 nano-technology business Light-emitting diode |
| Popis: | Colloidal metal-halide perovskite quantum dots (QDs) with a dimension less than the exciton Bohr diameter DB (quantum size regime) emerged as promising light emitters due to their spectrally narrow light, facile color tuning, and high photoluminescence quantum efficiency (PLQE). However, their size-sensitive emission wavelength and color purity and low electroluminescence efficiency are still challenging aspects. Here, we demonstrate highly efficient light-emitting diodes (LEDs) based on the colloidal perovskite nanocrystals (NCs) in a dimension > DB (regime beyond quantum size) by using a multifunctional buffer hole injection layer (Buf-HIL). The perovskite NCs with a dimension greater than DB show a size-irrespective high color purity and PLQE by managing the recombination of excitons occurring at surface traps and inside the NCs. The Buf-HIL composed of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) and perfluorinated ionomer induces uniform perovskite particle films with complete film coverage and prevents exciton quenching at the PEDOT:PSS/perovskite particle film interface. With these strategies, we achieved a very high PLQE (∼60.5%) in compact perovskite particle films without any complex post-treatments and multilayers and a high current efficiency of 15.5 cd/A in the LEDs of colloidal perovskite NCs, even in a simplified structure, which is the highest efficiency to date in green LEDs that use colloidal organic-inorganic metal-halide perovskite nanoparticles including perovskite QDs and NCs. These results can help to guide development of various light-emitting optoelectronic applications based on perovskite NCs. |
| Databáze: | OpenAIRE |
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