899422-06-1Relevant articles and documents
A Yellow-Emitting Homoleptic Iridium(III) Complex Constructed from a Multifunctional Spiro Ligand for Highly Efficient Phosphorescent Organic Light-Emitting Diodes
Ren, Bao-Yi,Guo, Run-Da,Zhong, Dao-Kun,Ou, Chang-Jin,Xiong, Gang,Zhao, Xiang-Hua,Sun, Ya-Guang,Jurow, Matthew,Kang, Jun,Zhao, Yi,Li, Sheng-Biao,You, Li-Xin,Wang, Lin-Wang,Liu, Yi,Huang, Wei
, p. 8397 - 8407 (2017)
To suppress concentration quenching and to improve charge-carrier injection/transport in the emission layer (EML) of phosphorescent organic light-emitting diodes (PhOLEDs), a facial homoleptic iridium(III) complex emitter with amorphous characteristics was designed and prepared in one step from a multifunctional spiro ligand containing spiro[fluorene-9,9′-xanthene] (SFX) unit. Single-crystal X-ray analysis of the resulting fac-Ir(SFXpy)3 complex revealed an enlarged Ir···Ir distance and negligible intermolecular π-π interactions between the spiro ligands. The emitter exhibits yellow emission and almost equal energy levels compared to the commercial phosphor iridium(III) bis(4-phenylthieno[3,2-c]pyridinato-N,C2′)acetylacetonate (PO-01). Dry-processed devices using a common host, 4,4′-bis(N-carbazolyl)-1,1′-biphenyl, and the fac-Ir(SFXpy)3 emitter at a doping concentration of 15 wt % exhibited a peak performance of 46.2 cd A-1, 36.3 lm W-1, and 12.1% for the current efficiency (CE), power efficiency (PE), and external quantum efficiency (EQE), respectively. Compared to control devices using PO-01 as the dopant, the fac-Ir(SFXpy)3-based devices remained superior in the doping range between 8 and 15 wt %. The current densities went up with increasing doping concentration at the same driving voltage, while the roll-offs remain relatively low even at high doping levels. The superior performance of the new emitter-based devices was ascribed to key roles of the spiro ligand for suppressing aggregation and assisting charge-carrier injection/transport. Benefiting from the amorphous stability of the emitter, the wet-processed device also exhibited respectful CE, PE, and EQE of 32.2 cd A-1, 22.1 lm W-1, and 11.3%, respectively, while the EQE roll-off was as low as 1.7% at the luminance of 1000 cd m-2. The three-dimensional geometry and binary-conjugation features render SFX the ideal multifunctional module for suppressing concentration quenching, facilitating charge-carrier injection/transport, and improving the amorphous stability of iridium(III)-based phosphorescent emitters.
Carbazole-endcapped Spiro[fluorene-9,9′-xanthene] with Large Steric Hindrance as Hole-transporting Host for Heavily-doped and High Performance OLEDs
Zhao, Xianghua,Wu, Yukun,Shi, Nannan,Li, Xiaoyu,Zhao, Yi,Sun, Mingli,Ding, Dongxue,Xu, Hui,Xie, Linghai
, p. 955 - 960 (2015)
In this work, we designed and synthesized a novel spirocyclic compound functionalized spiro[fluorene-9,9′-xanthene] with carbazole group (2-carbazolyl-spiro[fluorene-9,9′-xanthene], SFX-Cz) via Friedel-Crafts and Ullmann reaction, which is expected to own high thermal and morphological stability, and good carrier injection/transporting properties due to the excellent hole transporting characteristics of carbazole and cruciform structure of spiro[fluorene-9,9′-xanthene]. The carbazole end-capped spiro[fluorene-9,9′-xanthene] SFX-Cz based PhOLEDs with FIrpic as phosphor emitter have been researched by varying dopant concentration, which exhibit the maximum EQEs of 8.9%, 7.4%, 9.1%, and 4.7% with the doping increasing from 10% to 50%. The higher performance PhOLEDs are independent on concentration variation from 10% to 30%, which suggests the bulky steric hindrance of SFX-Cz might be a potential canditate for high performance and inexpensive device with simplified process. The bulky steric hindrance spiro[fluorene-9,9′-xanthene] SFX-Cz based blue PhOLEDs which are concentration-insensitive have been researched, which might simplify fabrication proess to achieve high perormance and low cost device.
Nondoped deep-blue spirofluorenexanthene-based green organic semiconductors (GOS) via a pot, atom and step economic (PASE) route combining direct arylation with tandem reaction
Sun, Ming-Li,Zhu, Wen-Sai,Zhang, Zhen-Song,Ou, Chang-Jin,Xie, Ling-Hai,Yang, Yang,Qian, Yan,Zhao, Yi,Huang, Wei
, p. 94 - 99 (2015)
Effective synthesis of organic semiconductors with pot, atom, and step economic (PASE) methods will be an indispensable part of green electronics. In this paper, we combined direct arylation with one-pot/tandem reaction to synthesize a green organic semiconductor (GOS), di(spiro[fluorene-9,9′-xanthene]-2-yl)-1,2,4,5-tetrafluorobenzene (DSFX-TFB), serving as the emitting layer for organic light-emitting devices (OLEDs). The maximum current efficiency (CE) of 3.2 cd A-1, power efficiency (PE) of 2.0 lm W-1 and external quantum efficiency (EQE) of 4.1% were obtained with the CIE coordinates (0.15, 0.08) in the nondoped deep-blue OLEDs. Meanwhile, good energy transfer and device performances with maximum CE of 8.03 cd A-1 and PE of 4.62 lm W-1 were achieved in typical sky-blue fluorescent OLEDs using DSFX-TFB as host and p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-Ph) as dopant material. This work provides a PASE synthetic route for GOSs and eco-friendly materials.
NOVEL HETEROCYCLIC COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME
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Paragraph 0113-0115, (2020/08/30)
Provided is a novel heterocyclic compound of Chemical Formula 1: and to an organic light emitting device including the same.
DELAYED FLUORESCENT COMPOUND, AND ORGANIC LIGHT EMITTING DIODE AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME
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Paragraph 0069; 0072; 0073, (2020/07/16)
The disclosure provides a delayed fluorescent compound of the Formula and an organic light emitting diode including a first electrode, a second electrode and an organic emitting layer between the first and second electrodes, where the delayed fluorescent
ORGANIC LIGHT EMITTING DEVICE
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Paragraph 0152; 0152-0155, (2019/07/23)
The present invention relates to an organic light emitting device comprising a light emitting layer and an electron transport layer which satisfy the following mathematical expressions, EHOMO-ET≤EHOMO-BH and ELUMO-ET>Esub
Spirofluorenexanthenyl derivatives and organic electroluminescent device including the same
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Paragraph 0099; 0100; 0101; 0102, (2018/07/30)
The present invention provides an organic compound represented by the following chemical formula a. In the above formula, R1 to R3, L, x, Ar1 and Ar2 are as defined in claims of the invention.
FUSED CYCLIC COMPOUND AND ORGANIC LIGHT EMITTING DEVICE USING THE SAME
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Paragraph 0315-0318, (2017/10/13)
Provided are a compound which is represented by chemical formula 1, and an organic light-emitting device including the same. According to an embodiment of the present invention, the condensed cyclic compound has a favorable energy level and exhibits outstanding electrochemical stability and thermal stability.COPYRIGHT KIPO 2017
A material of the electronic element
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, (2016/11/28)
The application relates to a compound of a formula (I) which is suitable for use as functional material in electronic devices.
HETERO-CYCLIC COMPOUND AND ORGANIC LIGHT EMITTING DIODE COMPRISING THE SAME
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Paragraph 0220; 0221; 0222; 0226; 0227; 0228, (2016/10/08)
The present invention relates to a hetero-cyclic compound and an organic light-emitting device comprising the same. The hetero-cyclic compound is represented by chemical formula 1. According to the present invention, the hetero-cyclic compound can be used as a material of an organic matter layer of an organic light-emitting device. The organic light-emitting device comprising the hetero-cyclic compound has low driving voltage, high efficiency, and/or long lifespan.COPYRIGHT KIPO 2016
