100124-06-9Relevant articles and documents
Deep blue organic light-emitting devices enabled by bipolar phenanthro[9,10-d]imidazole derivatives
Chen, Shuo,Wu, Yukun,Zhao, Yi,Fang, Daining
, p. 72009 - 72018 (2015)
Two blue fluorescent phenanthroimidazole derivatives (PhImFD and PhImTD) with a D-π-A structure are synthesized by attaching a hole-transporting dibenzofuran or dibenzothiophene and an electron-transporting phenanthroimidazole moiety and characterized. The nonplanar twisted structures reduce molecular aggregation, which endows both of the compounds with good thermal properties, and film-forming abilities as well as high quantum yields in CH2Cl2 and in the solid state. Non-doped organic light emitting diodes (OLEDs) are fabricated by employing the compounds PhImFD and PhImTD as emitters and exhibited promising performances. The devices show a deep blue emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.15, 0.11) for PhImFD and (0.15, 0.10) for PhImTD. PhImFD and PhImTD, with the desired bipolar-dominant characteristics, render devices with a low driving voltage of 3.6 V. The energy levels of the materials were found to be related to the donor units in the compounds with different substituents. Device B, using PhImTD as the emitting layer (EML), with well fitting energy levels and increased electron transport ability, possesses favorable efficiencies of 1.34 cd m-2 for CE, 0.82 lm W-1 for PE and 1.63% for EQE. PhImFD and PhImTD are utilized as blue emitters and the host for a yellow emitter, PO-01, to fabricate white organic light-emitting diodes (WOLEDs) that give a forward-viewing maximum CE of 8.12 cd m-2 and CIE coordinates of (0.339, 0.330). The results demonstrated not only that the phenanthroimidazole unit is an excellent building block to construct deep blue emission materials, but also that chemical structure modification by the introduction of a suitable electron-donor substituent could influence the performance of devices.
Aromatic compound and organoelectroluminescent device comprising the compound
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Paragraph 0740-0746, (2021/08/31)
The present invention relates to an aromatic compound and an organic electroluminescent device including the same. The aromatic compound is represented by chemical formula 1, and the organic electroluminescent device is excellent in driving voltage, luminous efficiency and lifetime characteristics.
Synthesis method of dibenzofuran/thiophene-4-boric acid
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Paragraph 0017, (2019/03/28)
The invention discloses a synthesis method of dibenzofuran/thiophene-4-boric acid, and belongs to the field of heterocyclic boric acid synthesis in organic chemistry. The synthesis method comprises the following steps: adding dibenzofuran or dibenzothioph
Fused cyclic compound and organoelectroluminescent device comprising the compound
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Paragraph 0105; 0124-0130, (2019/08/30)
PURPOSE: A condensed cyclic compound is provided to drive an organic electroluminescent device at low voltage and to improve brightness and economic efficiency. CONSTITUTION: A condensed cyclic compound is denoted by chemical formula 1. An organic electroluminescence device comprises an anode, a cathode, and a layer containing the condensed cyclic compounds, placed between the anode and the cathode. A light emitting layer between the anode and the cathode contains the condensed cyclic compounds. The organic electroluminescent device further comprises one or more layers selected among a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer.