Journal
NANOSCALE HORIZONS
Volume 5, Issue 3, Pages 473-480Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nh00641a
Keywords
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Funding
- program Ayudas para la atraccion de talento investigador - Modalidad 1 of the Consejeria de Educacion, Juventud y Deporte-Comunidad de Madrid [2016-T1/IND-1463]
- Spanish MINECO [RYC-2016-20891]
- Europa Excelencia program [ERC2019-092825]
- HYNANOSC [RTI2018-099504-A-C22]
- Madrid region [P2018/NMT-4367]
- Ministerio Project HYNANOSC [RTI2018-099504-A-C22]
- Deutsche Forschungsgemeinschaft [SFB 1249]
- Spanish Ministry of Science, Innovation and Universities [RTI2018-097508-B-I00]
- Regional Government of Madrid [S2018/NMT4511]
- Severo Ochoa Programme for Centres of Excellence in RD (MINECO) [SEV-2016-0686]
- BBVA Foundation
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This work rationalizes, for the first time, the electroluminescent behavior of a representative red-emitting contorted nanographene i.e., hexabenzoovalene derivative - in small molecule light-emitting electrochemical cells (SM-LECs). This new emitter provides devices with irradiances of ca. 220 mu W cm(-2) (242 cd m(-2)), external quantum efficiencies (EQE) of 0.78% (<25% loss of the maximum theoretical EQE), and stabilities over 200 h. Upon optimizing the device architecture, the stability increased up to 3600 h (measured) and 13000 h (extrapolated) at a high brightness of ca. 30 mu W cm(-2) (34 cd m(-2)). This represents a record stability at a high brightness level compared to the state-of-the-art SM-LECs (1000 h at 0.3 mu W cm(-2)). In addition, we rationalized one of the very rare LEC examples in which the changes of the electroluminescence band shape relates to the dependence of the relative intensity of the vibrational peaks with electric field, as corroborated by dynamic electrochemical impedance spectroscopy assays. Nevertheless, this exclusive electroluminescence behavior does not affect the device color, realizing one of the most stable, bright, and efficient red-emitting SM-LECs up to date.
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