4.6 Article

Extremely low efficiency roll-off in vacuum- and solution-processed deep-red/near-infrared OLEDs based on 1,8-naphthalimide TADF emitters

Journal

JOURNAL OF LUMINESCENCE
Volume 243, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jlumin.2021.118683

Keywords

Deep-red to near-infrared OLEDs; Efficiency roll-offs; Solution process

Categories

Funding

  1. National Key Research and Development Program, China [2017YFB0404300, 2017YFB0404301]
  2. National Natural Science Foundation of China [51572232, 51561135015, 51502254, 51872247]
  3. Fundamental Research Funds for the Central Universities, China [20720200075]
  4. Natural Science Foundation of Fujian Province of China [2020J01035]
  5. Shenzhen Science and Technology Innovation Committee, China [JCYJ20200109144614514]
  6. Shaanxi Provincial Department of Science and Technology, China [2018ZKC046]

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This study designed and synthesized a series of wedge-shaped emitters based on 1,8-naphthalimide derivatives, and investigated their application in DR-NIR TADF OLEDs. The experimental results showed that these emitters exhibited good electroluminescence performance and reduced efficiency roll-offs, and the efficiency roll-offs of DR-NIR TADF OLEDs can be greatly reduced by designing emitters with appropriate molecular structures.
Deep-red to near-infrared (DR-NIR) organic light-emitting diodes (OLEDs) based on purely organic thermally activated delayed fluorescence (TADF) emitters usually suffer from serious efficiency roll-offs. Herein, a series of 1,8-Naphthalimide-derivatives-based wedge-shape emitters, 2DN and 2PN, were designed and synthesized by adopting multiple donor units and isopropyl modification strategies. 2DN and 2PN exhibited strong DR-NIR TADF in the range 646-755 nm in toluene and films. The OLEDs, fabricated by both vacuum-deposition and solution-processed methods, all exhibited desired DR-NIR electroluminescence in the range 629-701 nm, and significantly reduced efficiency roll-offs (8.4% for 2DN and near zero for 2PN at 100 cd m(-2)), which benefit from short delayed lifetime (36.4 us for 2DN and 14.0 us for 2PN) and negligible pi-pi stacking in aggregation states. It indicates that the efficiency roll-offs of DR-NIR TADF OLEDs can be greatly reduced by designing emitters with appropriate design of molecular structures.

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