Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 29, Pages 26144-26151Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b06401
Keywords
thermally activated delayed fluorescence; dibenzo[a,c]phenazine derivatives; intramolecular charge transfer; orange-red emission; organic light emitting diodes
Funding
- National Key R&D Program of China [2016YFB0401002]
- National Natural Science Foundation of China [61520106012, 61705154]
Ask authors/readers for more resources
The design and synthesis of highly efficient thermally activated delayed fluorescence (TADF) emitters with an electroluminescence wavelength beyond 600 nm remains a great challenge for organic light-emitting diodes (OLEDs). To solve this issue, three TADF molecules, xDMAC-BP (x = 1, 2, 3), are developed in combination with the rigid planar dibenzo[a,c]phenazine (BP) acceptor core and different numbers of 9,9-dimethylacridan (DMAC) donors. All these emitters possess stable internal charge transfer and a large dihedral angle between the donors and planar BP core. The emission wavelength can be regulated from 541 to 605 nm by increasing the number of the donor DMAC units because of the controllable tuning of the intramolecular charge transfer effect and the molecular geometrical structure. The photoluminescence quantum yields of these emitters are improved from 42 to 89% with the increase in the number of DMAC units. The orange-red OLEDs employing the xDMAC-BP emitters exhibit maximum external quantum efficiency (EQE) of 22.0% at 606 nm, which is the highest EQE of the previously reported TADF OLEDs exceeding 600 nm.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available