Stable organic light-emitting diodes based on thioxanthone derivative with shortened photoluminescence delayed lifetime
Source abstract
Abstract
The device stability of the devices based on thermally active delayed fluorescence is still unsatisfactory, although their efficiencies of the reported devices have reached those of phosphorescent emitters for application. Reducing the triplet related nonradiative process is the most efficient method to enhance the device stability. In this work, we designed and synthesized a TADF molecule 4,5-TXO-PhCz with a reduced delayed fluorescence lifetime of only 11.3 μs. Based on this molecule, the OLED device can reach a maximum EQE of 18.6% with a low efficiency roll-off, the device can even retain 9.38% at luminescence of 5000 cd/m 2 . The short PL delayed lifetime suppressed the triplet-related nonradiative annihilation and reduced the efficiency roll-off, affording an excellent device stability with a half lifetime of 380 h. These results indicate that reducing the delayed fluorescence lifetime can effectively reduce the device efficiency roll-off and improve the device stability.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Luminescence and Fluorescent Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. Dipole-dipole interaction management for efficient blue thermally activated delayed fluorescence diodes
2. Creating side transport pathways in organic solar cells by introducing delayed fluorescence molecules10.1021/acs.chemmater.1c01044 ↗
3. High-efficiency electroluminescence and amplified spontaneous emission from a thermally activated delayed fluorescent near-infrared emitter10.1038/s41566-017-0087-y ↗
4. Visible-light-excited ultralong organic phosphorescence by manipulating intermolecular interactions10.1002/adma.201701244 ↗
5. Organic thermally activated delayed fluorescence (TADF) compounds used in photocatalysis10.1039/D1CS00198A ↗
6. Organic electroluminescent diodes10.1063/1.98799 ↗
7. High efficiency and long lifetime of a fluorescent blue-light emitter made of a pyrene core and optimized side groups10.1021/acsami.8b09013 ↗
8. Highly efficient phosphorescent emission from organic electroluminescent devices10.1038/25954 ↗
9. Deep blue phosphorescent organic light-emitting diodes with very high brightness and efficiency10.1038/nmat4446 ↗
10. Recent progress in hot exciton materials for organic light-emitting diodes10.1039/D0CS00391C ↗
11. Purely organic thermally activated delayed fluorescence materials for organic light-emitting diodes10.1002/adma.201605444 ↗
12. Realizing efficient single organic molecular white light-emitting diodes from conformational isomerization of quinazoline-based emitters10.1021/acsami.9b20162 ↗
13. Thermally activated delayed fluorescence materials towards the breakthrough of organoelectronics10.1002/adma.201402532 ↗
14. Theoretical predication for transition energies of thermally activated delayed fluorescence molecules10.1016/j.cclet.2016.07.017 ↗
15. All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes10.1038/natrevmats.2018.20 ↗
16. Novel thioxanthone host material with thermally activated delayed fluorescence for reduced efficiency roll-off of phosphorescent OLEDs10.1016/j.cclet.2017.07.025 ↗
17. Recent progress of singlet-exciton-harvesting fluorescent organic light-emitting diodes by energy transfer processes10.1002/adma.201803714 ↗
18. Recent advances in organic thermally activated delayed fluorescence materials10.1039/C6CS00368K ↗
19. Highly efficient hybrid warm white organic light-emitting diodes using a blue thermally activated delayed fluorescence emitter: exploiting the external heavy-atom effect10.1038/lsa.2015.5 ↗
20. Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states10.1038/s41566-020-0668-z ↗
21. Purely organic crystals exhibit bright thermally activated delayed fluorescence10.1002/anie.201906371 ↗
22. Red organic light-emitting diode with external quantum efficiency beyond 20% based on a novel thermally activated delayed fluorescence emitter10.1002/advs.201800436 ↗
23. A new design strategy for efficient thermally activated delayed fluorescence organic emitters: from twisted to planar structures10.1002/adma.201702767 ↗
24. Triazatruxene: a rigid central donor unit for a D-A3 thermally activated delayed fluorescence material exhibiting sub-microsecond reverse intersystem crossing and unity quantum yield via multiple singlet-triplet state pairs10.1002/advs.201700989 ↗
25. Efficiency roll-off in organic light-emitting diodes10.1002/adma.201301603 ↗
26. Long-lived efficient delayed fluorescence organic light-emitting diodes using n-type hosts10.1038/s41467-017-02419-x ↗
27. Degradation mechanisms and reactions in organic light-emitting devices10.1021/cr400704v ↗
28. High efficiency and stable organic light-emitting diodes based on thermally activated delayed fluorescence emitter10.1088/0256-307X/33/8/088501 ↗
29. Triplet decay-induced negative temperature dependence of the transient photoluminescence decay of thermally activated delayed fluorescence emitter10.1039/C7TC04025C ↗
30. Influence of host matrix on thermally-activated delayed fluorescence: effects on emission lifetime, photoluminescence quantum yield, and device performance10.1016/j.orgel.2014.05.027 ↗
31. Universal strategy for Ohmic hole injection into organic semiconductors with high ionization energies10.1038/s41563-018-0022-8 ↗
32. Substitution conformation balances the oscillator strength and singlet–triplet energy gap for highly efficient D–A–D thermally activated delayed fluorescence emitters10.1002/adom.201801767 ↗
33. Novel thermally activated delayed fluorescence materials–thioxanthone derivatives and their applications for highly efficient OLEDs10.1002/adma.201401393 ↗
34. Thermally activated delayed fluorescence with 7% external quantum efficiency from a light-emitting electrochemical cell10.1038/s41467-019-13289-w ↗
35. Phosphorescence versus thermally activated delayed fluorescence. Controlling singlet–triplet splitting in brightly emitting and sublimable Cu(I) compounds10.1021/ja508155x ↗
36. Transient analysis of organic electrophosphorescence. II. Transient analysis of triplet-triplet annihilation10.1103/PhysRevB.62.10967 ↗
37. Diboron compound-based organic light-emitting diodes with high efficiency and reduced efficiency roll-off10.1038/s41566-018-0112-9 ↗
38. Highly efficient, conventional, fluorescent organic light-emitting diodes with extended lifetime10.1002/adma.201702159 ↗
39. Sterically shielded blue thermally activated delayed fluorescence emitters with improved efficiency and stability10.1039/C5MH00258C ↗
40. Highly efficient and stable electron injection layer for inverted organic light-emitting diodes10.1021/am506300c ↗