23102-67-2Relevant articles and documents
Blue organic light-emitting diodes containing anthracene derivatives with end-capping phenyl group
Jang, Heung Soo,Lee, Kum Hee,Lee, Seok Jae,Kim, Young Kwan,Yoon, Seung Soo
, p. 173 - 184 (2012)
We have synthesized and characterized new blue host materials for OLEDs; 9,10-di-o-tolylanthracene (1), 2-tert-butyl-9,10-diphenylanthracene (2), 10,10-diphenyl-9,9-bianthracene (3), and 1,4-bis(10-phenylanthracen-9-yl)benzene (4). To explore electroluminescent properties of these materials, multilayered OLEDs with the configuration of ITO/NPB (50nm)/Blue emitters (1-4) (30nm)/Liq (2nm)/Al (100nm) were fabricated. Among those non-doped devices, the device 4a employing 4 as an emitter showed high efficiencies of 4.11 cd/A, 3.31 lm/W, and 2.35%, respectively. The device 2b employing 2 as host material for PFVtPh blue dopant material exhibited excellent efficiencies with 5.64 cd/A, 4.14 lm/W, and 4.54%. Taylor and Francis Group, LLC.
Absence of delayed fluorescence and triplet-triplet annihilation in organic light emitting diodes with spatially orthogonal bianthracenes
Pu, Yong-Jin,Satake, Rei,Koyama, Yuki,Otomo, Takahiro,Hayashi, Rika,Haruta, Naoki,Katagiri, Hiroshi,Otsuki, Daisuke,Kim, Daegwi,Sato, Tohru
supporting information, p. 2541 - 2547 (2019/03/08)
Two compounds, 2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN), which has a single anthracene unit, and 10,10′-diphenyl-9,9'-bianthracene (PPBA), which has two spatially orthogonal anthracene units, were compared and investigated in terms of photoelectric characteristics and the reverse intersystem crossing (RISC) process in organic light emitting diodes (OLEDs). Transient electroluminescence (EL) measurements indicated large contributions of triplet-triplet annihilation (TTA) for MADN but almost no contribution of TTA for PPBA. The magnetic field dependence of EL for the two anthracene compounds was also different. The EL of MADN was sensitive to the magnetic field at high current density, but PPBA showed less dependence, which indicated the absence of the TTA process for PPBA. TD-DFT calculations revealed that PPBA has doubly degenerate lowest triplet states (T1 and T2) with a much lower energy than S1, which is unfavorable for thermally activated delayed fluorescence (TADF). The near-zero ΔEST between highly excited states Sm≥1 and Tn>2 is favorable to RISC at a highly excited state. Oxygen quenching of photoluminescence only for PPBA and decreasing EL intensity with decreasing temperature only for PPBA support the existence of the RISC path from Tn>2 to Sm≥1. A high external quantum efficiency of 11% in blue OLEDs with PPBA was obtained, indicating that this orthogonal anthracene type of molecular design for RISC at a highly excited state would expand the material development of compounds emitting blue fluorescence for OLEDs.
THIADIAZOLE-BASED COMPOUND, LIGHT EMITTING ELEMENT COMPOUND, LIGHT EMITTING ELEMENT, LIGHT EMITTING DEVICE, AUTHENTICATION DEVICE, AND ELECTRONIC DEVICE
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Page/Page column 50, (2012/11/07)
Provided is a thiadiazole compound with high efficiency and long life which emits light in a near-infrared region and represented by Formula (I). [In the Formula (I), As each independently represent an aryl group which may have a substituent or a diarylamino group.]