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- W3119477789 endingPage "105746" @default.
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- W3119477789 abstract "Developing thermally activated delayed fluorescence (TADF) white organic light emitting diodes (WOLED) featuring high power efficiencies faces a challenge in balancing carrier transport, energy transfer and quenching suppression. Here, we demonstrate that host matrix is crucial for the modification of optoelectronic process in emissive layers (EML) and the achievement of high power efficiency. Through asymmetrically introducing two or three diphenylphosphine oxide (DPPO) groups, three phosphine oxide (PO) hosts 24DBFDPO, 26DBFDPO and 248DBFTPO were constructed, in which dibenzofuran (DBF) chromophore is embedded by rationally spatial distribution of DPPO groups in 26DBFDPO and 248DBFTPO. Direct steric effect of DPPOs suppresses the host-dopant and dopant-dopant interaction induced quenching and mitigates excessive dopant-dopant energy transfer. Dually-doped white TADF films of 248DBFTPO reveal the improved white color purity with a high quantum yield of ~ 90%. Simultaneously, remote steric and electron-withdrawing effects of DPPOs remedy carrier transport in 248DBFTPO films. Based on a simple trilayer single-EML device structure, 248DBFTPO endowed its full-TADF WOLEDs with the state-of-the-art performance, especially the top-rank power efficiency beyond 70 lm W−1. This work indicates host engineering can provide a feasible approach to realize the practical application of TADF daily lighting." @default.
- W3119477789 created "2021-01-18" @default.
- W3119477789 creator A5017947172 @default.
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- W3119477789 date "2021-05-01" @default.
- W3119477789 modified "2023-09-26" @default.
- W3119477789 title "High-power-efficiency thermally activated delayed fluorescence white organic light-emitting diodes based on asymmetrical host engineering" @default.
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- W3119477789 doi "https://doi.org/10.1016/j.nanoen.2021.105746" @default.
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