902518-11-0Relevant articles and documents
Modulation of the Physicochemical Properties of Donor–Spiro–Acceptor Derivatives through Donor Unit Planarisation: Phenylacridine versus Indoloacridine—New Hosts for Green and Blue Phosphorescent Organic Light-Emitting Diodes (PhOLEDs)
Thiery, Sébastien,Tondelier, Denis,Geffroy, Bernard,Jeannin, Olivier,Rault-Berthelot, Jo?lle,Poriel, Cyril
, p. 10136 - 10149 (2016)
This work reports a detailed structure–property relationship study of a series of efficient host materials based on the donor–spiro–acceptor (D-spiro-A) design for green and sky-blue phosphorescent organic light-emitting diodes (PhOLEDs). The electronic and physical effects of the indoloacridine (IA) fragment connected through a spiro bridge to different acceptor units, namely, fluorene, dioxothioxanthene or diazafluorene moiety, have been investigated in depth. The resulting host materials have been easily synthesised through short, efficient, low-cost, and highly adaptable synthetic routes by using common intermediates. The dyes possess a very high triplet energy (ET) and tuneable HOMO/LUMO levels, depending on the strength of the donor/acceptor combination. The peculiar electrochemical and optical properties of the IA moiety have been investigated though a fine comparison with their phenylacridine counterparts to study the influence of planarisation. Finally, these molecules have been incorporated as hosts in green and sky-blue PhOLEDs. For the derivative SIA-TXO2as a host, external quantum efficiencies as high as 23 and 14 % have been obtained for green and sky-blue PhOLEDs, respectively.
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).
Organic Light Emitting Material and Organic Light Emitting Diode Having The Same
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Paragraph 0104-0107, (2021/11/02)
The present invention relates to a compound derivative for an organic electroluminescent device and an organic electroluminescent device using the same. The present invention relates to an aromatic compound including an indolocarbazolyl group and a spirobifluorenyl group, and more particularly, to an aromatic compound including an indolocarbazolyl group and a spirobifluorenyl group.
Impact of the donor structure in new D-π-A systems based on indolo[3,2,1-jk]carbazoles on their thermal, electrochemical, optoelectronic and luminescence properties
Goriachiy, Dmitry,Ma?kowski, Sebastian,Schab-Balcerzak, Ewa,Siwy, Mariola,Slodek, Aneta,Sulowska, Karolina,Szafraniec-Gorol, Gra?yna,Taydakov, Ilya,Vasylieva, Marharyta,Zych, Dawid
, p. 7351 - 7362 (2021/06/22)
In this work, novel fluorophores with D-π-A architectures (ICz-1-ICz-6) were synthesized and investigated, where the indolo[3,2,1-jk]carbazole (ICz) framework is connected by an ethylene bridge with extensive donor moieties -e.g., fluorene, carbazole, phenothiazine, methoxyphenyl, bithiophene, and dibenzothiophene. The influences of the donor character of the substituents in the indolocarbazole derivatives on their thermal, optical and electrochemical properties were explored and compared with the quantum chemical calculations based on DFT and TD-DFT. AllICz-1-ICz-6compounds emit blue light with emission peaks between 390 and 430 nm in solution, except for compoundICz-5with a strong phenothiazine donor, which emits light at 463 nm. TheICz-6derivative with the dibenzothiophene unit features an exception to Kasha's rule. For the selected compoundsICz-2,ICz-4, andICz-5, preliminary electroluminescence tests were performed, both based on devices with a neat compound (ITO/PEDOT:PSS/ICz/Al) and with a guest-host configuration (ITO/PEDOT:PSS/PVK:PBD:ICz/Al), where two emission bands were detected covering the range from 400 to over 900 nm. Additionally, several multilayer OLED devices (ITO/PEDOT:PSS/poly-TPD/ICz-2-5/TPBi/LiF/Al) were prepared, and all diodes showed electroluminescence at 570 nm.
