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Title: | Operationally Stable Perovskite Light Emitting Diodes with High Radiance | Authors: | Elkhouly, Karim Goldberg, Iakov BOYEN, Hans-Gerd Franquet, Alexis Spampinato, Valentina Ke, Tung-Huei Gehlhaar, Robert Hofkens, Johan Heremans, Paul GENOE, Jan Qiu, Weiming |
Issue Date: | 2021 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | Advanced Optical Materials, 9(15), (Art N° 2100586) | Abstract: | Although perovskite light emitting diodes (PeLEDs) have shown fast advances in external quantum efficiency (EQE), their operational stability is still low compared to other LED devices. Here, stable PeLEDs are demonstrated with high radiance primarily by using 6,6 '-phenyl-C-61-butyric acid methyl ester (PCBM) and magnesium-doped Zinc oxide (ZnMgO) injection layers to reduce the driving voltage. Through different characterizations, it is revealed that the use of PCBM/ZnMgO electron injection layer can effectively mitigate Joule heating, block the migration of Al electrode towards perovskite layer as well as avoid the breakdown of main perovskite crystal structure under prolonged operation. Combining the PCBM/ZnMgO electron injection layer with a formamidinium-based perovskite light emitter, the optimal device shows an EQE of 11.4% at 330 mA cm(-2) and a radiance of 399 W Sr-1 m(-2) at 3.1 V. The device remains above 50% of the maximum performance after operating for 525 and 118 h at constant current densities of 50 and 100 mA cm(-2), respectively. Thus, this work presents a substantial improvement in the stability of PeLEDs and the methods to consolidate this progress even further. | Notes: | Heremans, P; Qiu, WM (corresponding author), IMEC, Kapeldreef 75, B-3001 Leuven, Belgium.; Heremans, P; Qiu, WM (corresponding author), Katholieke Univ Leuven, ESAT, Kasteelpk Arenberg, B-3001 Leuven, Belgium.; Qiu, WM (corresponding author), Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200F, B-3001 Leuven, Belgium. Paul.Heremans@imec.be; Weiming.Qiu@imec.be |
Other: | Heremans, P; Qiu, WM (corresponding author), IMEC, Kapeldreef 75, B-3001 Leuven, Belgium ; Katholieke Univ Leuven, ESAT, Kasteelpk Arenberg, B-3001 Leuven, Belgium. Qiu, WM (corresponding author), Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200F, B-3001 Leuven, Belgium. Paul.Heremans@imec.be; Weiming.Qiu@imec.be | Keywords: | band alignment;device stability;high radiance;light emitting diodes;metal halide perovskites | Document URI: | http://hdl.handle.net/1942/34238 | ISSN: | 2195-1071 | e-ISSN: | 2195-1071 | DOI: | 10.1002/adom.202100586 | ISI #: | 000646727500001 | Rights: | 2021 Wiley-VCH GmbH | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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Advanced Optical Materials - 2021 - Elkhouly - Operationally Stable Perovskite Light Emitting Diodes with High Radiance.pdf Restricted Access | Published version | 3.32 MB | Adobe PDF | View/Open Request a copy |
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