131013-62-2Relevant articles and documents
Spiro?type TADF emitters based on acridine donors and anthracenone acceptor
Hong, Jong-In,Huh, Jin-Suk,Yang, Dongwook
, (2021/10/27)
Two rigid spiro-type TADF emitters (CBZANQ, PXZANQ) were designed and synthesized via a two-step route. CBZANQ and PXZANQ both contain an anthracenone acceptor along with a carbazole?acridine-fused donor and a phenoxazine?acridine-fused donor, respectively, where each donor and acceptor are linked by a spiro bridge to form D-σ-A structures with an orthogonal arrangement. Both CBZANQ and PXZANQ have the difference between the singlet and triplet energy values (ΔEST) of 0.05 eV and 0.03 eV, respectively, which are sufficiently small for efficient triplet harvesting. CBZANQ with a weak electron donor (carbazole) exhibited a weak intramolecular charge transfer (ICT) character, resulting in a low photoluminescence quantum yield (PLQY) of 18%. On the other hand, when combined with a strong electron donor (phenoxazine), PXZANQ exhibited a strong ICT character, resulting in a high PLQY of 71%. Organic light-emitting diode (OLED) devices based on CBZANQ emitter and bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO) host exhibited sky-blue electroluminescence (EL) at 492 nm with a low external quantum efficiency (EQE) of 6.7%. Conversely, the OLED devices fabricated using PXZANQ emitter and DPEPO host exhibited green emission at 528 nm, along with a high EQE of 22.1%. Additionally, the efficiency of PXZANQ-based devices remained high at high luminance, indicating relatively small efficiency roll-off (13.9% EQE under 500 cd/m2).
Compound, display panel and display device
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Paragraph 0098; 0107-0109, (2020/11/12)
The invention belongs to the technical field of OLEDs and provides a compound having a structure represented by formula I. In the formula I, L1 and L2 are each independently selected from a single bond, a C6-C30 aryl group and a C4-C30 heteroaryl group, a and b are each independently selected from 1, 2, 3 and 4, D1 and D2 are independently selected from nitrogen-containing electron donor units, including carbazolyl and derivative groups thereof, acridinyl and derivative groups thereof, diarylamino and derivative groups thereof, and triarylamino and derivative groups thereof, c and d are each independently selected from 1, 2, 3 and 4, in addition, due to the introduction of an S=O group, the compound has stronger electron withdrawing capability, and a core unit has the characteristics of anelectron acceptor, meanwhile, S=O double bonds are located at a connection point of a spiro ring, LUMO at the connection point has sp3 hybridization characteristics and a regular tetrahedron space structure, LUMO energy level dispersion is more uniform, and a bipolar host material or a TADF luminescent material with excellent performance can be obtained by matching with an electron donor. The invention further provides a display panel and a display device.
Indolo [3, 2, 1-kl] phenoxazine compound, preparation method and application thereof, and electronic device
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Paragraph 0091-0092, (2020/10/05)
The invention provides an indolo [3, 2, 1-kl] phenoxazine compound, application of the indolo [3, 2, 1-kl] phenoxazine compound and an electronic device. The indolo [3, 2, 1-kl] phenoxazine compound according to the invention has excellent film-forming properties and thermal stability by introducing a rigid structure of indolo [3, 2, 1-kl] phenoxazine, and can be used for preparing an organic electroluminescent device, a perovskite solar cell, an organic field effect transistor and an organic solar cell. Furthermore, the indolo [3, 2, 1-kl] phenoxazine compound of the invention can be used asa constituent material of a hole injection layer, a hole transport layer, a light-emitting layer, an electron blocking layer, a hole blocking layer or an electron transport layer, and can reduce a driving voltage, improve efficiency, brightness and lifespan, etc. More importantly, the indolo [3, 2, 1-kl] phenoxazine compound disclosed by the invention has very good planarity, so that carriers canbe efficiently transmitted, and the indolo [3, 2, 1-kl] phenoxazine compound is an ideal skeleton for constructing a hole transmission material. The preparation method of the indolo [3, 2, 1-kl] phenoxazine compound is simple, raw materials are easy to obtain, and industrial development requirements can be met.
