Mixed-host engineering of blue thermally activated delayed fluorescence devices for enhanced efficiency and suppressed efficiency roll-off
Source abstract
Abstract
Abstract Blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) with enhanced efficiency and suppressed efficiency roll-offs were fabricated using a mixed host consisting of 3,3-di(9H-carbazol-9-yl)-biphenyl (mCBP) and bis[2-(diphenyl-phosphino)phenyl]ether oxide (DPEPO). Notably, mCBP and DPEPO, which are generally used as hosts in blue TADF OLEDs, exhibit material stability and efficiency as their trade-off characteristics. The mixed-host structure, when applied to 10,10′-(4,4′-sulfonylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine), which is a blue TADF dopant, facilitated a maximum efficiency of 18.1%. Furthermore, the critical current density (J0), at which the external quantum efficiency decreases by half of its maximum value, was observed to be 3.9 times that of the DPEPO device.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. Recent advances of the emitters for high performance deep-blue organic light-emitting diodes10.1039/C4TC02474E ↗
2. Chemical degradation in organic light-emitting devices: mechanisms and implications for the design of new materials10.1002/adma.201205022 ↗
3. Degradation of blue-phosphorescent organic light-emitting devices involves exciton-induced generation of polaron pair within emitting layers10.1038/s41467-018-03602-4 ↗
4. Syntheses and phosphorescent properties of blue emissive iridium complexes with tridentate pyrazolyl ligands10.1021/ic800196s ↗
5. Research grants: conform and be funded10.1038/492034a ↗
6. Thermally activated delayed fluorescence carbonyl derivatives for organic light-emitting diodes with extremely narrow full width at half-maximum10.1021/acsami.8b19635 ↗
7. Host-free yellow-green organic light-emitting diodes with external quantum efficiency over 20% based on a compound exhibiting thermally activated delayed fluorescence10.1021/acsami.8b18798 ↗
8. Design of efficient thermally activated delayed fluorescence blue host for high performance solution-processed hybrid white organic light emitting diodes10.1039/C8SC05456H ↗
9. Photophysics of deep blue acridane- and benzonitrile-based emitter employing thermally activated delayed fluorescence10.1021/acs.jpcc.8b08716 ↗
10. High performance blue-emitting organic light-emitting diodes from thermally activated delayed fluorescence: a guest/host ratio study10.1063/1.5041447 ↗
11. Asymmetric thermally activated delayed fluorescence (TADF) emitters with 5,9-dioxa-13bboranaphtho[3,2,1-de]anthracene (OBA) as the acceptor and highly efficient blue-emitting OLEDs10.1039/C9TC04115J ↗
12. Stable blue thermally activated delayed fluorescent organic light-emitting diodes with three times longer lifetime than phosphorescent organic light-emitting diodes10.1002/adma.201500267 ↗
13. Design of efficient thermally activated delayed fluorescence materials for pure blue organic light emitting diodes10.1021/ja306538w ↗
14. Sterically shielded blue thermally activated delayed fluorescence emitters with improved efficiency and stability10.1039/C5MH00258C ↗
15. An alternative host material for long-lifespan blue organic light-emitting diodes using thermally activated delayed fluorescence10.1002/advs.201600502 ↗
16. Luminous butterflies: efficient exciton harvesting by benzophenone derivatives for full-color delayed fluorescence OLEDs10.1002/anie.201402992 ↗
17. Molecular engineering of high efficiency and long lifetime blue thermally activated delayed fluorescent emitters for vacuum and solution processed organic light-emitting diodes10.1002/adom.201500634 ↗
18. Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence10.1038/nphoton.2014.12 ↗
19. Perspective on host materials for thermally activated delayed fluorescence organic light emitting diodes10.1002/adom.201800565 ↗
20. Organic light-emitting devices with a mixture emitting layer of tris-(8-hydroxyquinoline) aluminum and 4,4′-bis(carbazol-9-yl)-biphenyl10.1063/1.2209708 ↗
21. The relationship between the device performance and hole mobility of host materials in mixed host system for deep blue phosphorescent organic light emitting devices10.1016/j.orgel.2011.08.021 ↗
22. Degradation mechanisms of organic light-emitting diodes based on thermally activated delayed fluorescence molecules10.1021/acs.jpcc.5b07084 ↗
23. Recombination zone in mixed-host organic light-emitting devices10.1063/1.2361266 ↗
24. Nonradiative recombination centers and electrical aging of organic light-emitting diodes: direct connection between accumulation of trapped charge and luminance loss10.1063/1.1531231 ↗
25. Organic light-emitting diodes with a bipolar transport layer10.1063/1.124309 ↗
26. Triplet exciton confinement in green organic light‐emitting diodes containing luminescent charge‐transfer Cu(I) complexes10.1002/adfm.201101907 ↗
27. Lifetime enhancement of blue thermally activated delayed fluorescent devices by separated carrier channels using dibenzofuran-triazine type hosts10.1016/j.jiec.2018.01.003 ↗
28. Light emission mechanism of mixed host organic light-emitting diodes10.1063/1.4916549 ↗
29. Highly efficient sky-blue fluorescent organic light emitting diode based on mixed cohost system for thermally activated delayed fluorescence emitter (2CzPN)10.1021/acsami.6b00286 ↗
30. Nearly 100% internal quantum efficiency in undoped electroluminescent devices employing pure organic emitters10.1002/adma.201405474 ↗
31. Degradation mechanism and lifetime improvement strategy for blue phosphorescent organic light‐emitting diodes10.1002/adom.201600901 ↗
32. Storage of charge carriers on emitter molecules in organic light-emitting diodes10.1103/PhysRevB.86.075204 ↗
33. Impedance spectroscopy as a probe for the degradation of organic light-emitting diodes10.1063/1.3294642 ↗
34. Impedance model of trap states for characterization of organic semiconductor devices10.1063/1.3693545 ↗
35. Pentacene Schottky diodes studied by impedance spectroscopy: doping properties and trap response10.1103/PhysRevB.88.195205 ↗
36. Capacitance-voltage characteristics of a 4,4′-bis[(N-carbazole)styryl]biphenyl based organic light-emitting diode: implications for characteristic times and their distribution10.1063/1.4819436 ↗
37. Charge transport layers manage mobility and carrier density balance in light-emitting layers influencing the operational stability of organic light emitting diodes10.1016/j.orgel.2018.12.026 ↗
38. Mobility balance in the light-emitting layer governs the polaron accumulation and operational stability of organic light-emitting diodes10.1063/1.5004623 ↗
39. Blue organic electro phosphorescence using exothermic host–guest energy transfer10.1063/1.1568146 ↗
40. Engineering efficiency roll-off in organic light-emitting devices10.1002/adfm.201401009 ↗