19019-10-4Relevant academic research and scientific papers
Thermal activation delayed fluorescence material and preparation method thereof, and organic electroluminescent device
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Paragraph 0128-0130, (2020/06/17)
The invention relates to a thermal activation delayed fluorescence material and a preparation method thereof, and an organic electroluminescent device. The thermal activation delayed fluorescence material is a compound with a structure represented by a formula (I), wherein in the formula (I), R1, R2, R3 and R4 are respectively and independently nitrogen-containing electron-donating groups or hydrogen atoms, at least one of R1, R2, R3 and R4 is a nitrogen-containing electron-donating group, the nitrogen-containing electron-donating group is connected with a corresponding benzene ring through anN atom, and R5 and R6 are respectively and independently a hydrogen atom or an alkyl group containing 1-4 carbon atoms. The series of the materials can reduce the energy level difference between a triplet state and a singlet state, so that the light-emitting quantum efficiency of a device can be improved, and the light-emitting efficiency can reach more than 8%.
Highly efficient deep-blue OLEDs based on hybridized local and charge-transfer emitters bearing pyrene as the structural unit
Fu, Caixia,Luo, Shuai,Li, Zhenzhen,Ai, Xin,Pang, Zhenguo,Li, Chuan,Chen, Kuan,Zhou, Liang,Li, Feng,Huang, Yan,Lu, Zhiyun
supporting information, p. 6317 - 6320 (2019/06/07)
A new family of hybridized local and charge-transfer (HLCT) emitters bearing a pyrene structural unit has been developed. Deep-blue OLEDs based on them achieved high brightness over 10000 cd m-2, high maximum external quantum efficiency over 10.5%, and high maximum exciton utilization efficiency approaching 100%, with CIE coordinates of (0.152, 0.065).
Derivative of five-membered ring fused unit containing thioxanthene and preparation method and application of derivative
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Paragraph 0064; 0066; 0067; 0077, (2018/07/15)
The invention belongs to the field of organic optoelectronics, and discloses a derivative of a five-membered ring fused unit containing thioxanthene and a preparation method and application of the derivative. The chemical structural formula of the derivative of the five-membered ring fused unit containing the thioxanthene meets one of the general formulas shown in the description. Accordingly, themolecular structure becomes larger through a ring closing reaction, the high molecule rigidity is achieved, the thermostability of molecules is improved conveniently, the five-membered ring fused structure formed by ring closure makes conjugation enhanced, the carrier transport performance can be improved, the derivative serves as phosphor main materials, organic light-emitting diodes are prepared through evaporation, and the device performance can be improved.
Noble Compound Exhibiting Thermally Activated Delayed Fluorescence and Organic Light-Emitting device Using the Same
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Paragraph 0029; 0039-0041, (2018/03/23)
The present invention relates to a novel compound which due to having little difference between a singlet energy state and a triplet energy state, exhibits a thermally activated delayed fluorescence by reverse intersystem crossing when heat is applied, that generates the singlet energy state from the triplet energy state; and to an organic light-emitting device which applies the same to a dopant of an organic light-emitting layer. Specifically, the present invention relates to a compound represented by chemical formula 1; and to an organic light-emitting device which applies the same to a dopant of an organic light-emitting layer, wherein in the chemical formula 1, R_1 and R_2 may be identical or different from each other, and are a pyridoindole group, a phenyl group, a carbazole group, a 9,9-dimethyl-9,10-dihydroacridine group, a 10H-phenothiazine group, or 10H-phenoxazine group, and R_3 is a methyl or phenyl group.COPYRIGHT KIPO 2017
Organic compound for electronic element, including the organic light emitting device and display device including the organic light emitting element
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Paragraph 0224; 0225; 0226; 0227, (2016/10/07)
A compound for an organic optoelectronic device, an organic light-emitting device including the same and a display device including the organic light-emitting device are provided, and the compound for an organic optoelectronic device represented by a combination of the following Chemical Formulae 1 and 2 is provided and thus an organic light-emitting device has improved life-span characteristics due to excellent electrochemical and thermal stability, and high luminous efficiency at a low driving voltage.
Rigid NON- and NSN-ligand complexes of tetravalent and trivalent uranium: Comparison of U-OAr2 and U-SAr2 bonding
Vidjayacoumar, Balamurugan,Ilango, Sougandi,Ray, Matthew J.,Chu, Terry,Kolpin, Kristopher B.,Andreychuk, Nicholas R.,Cruz, Carlos A.,Emslie, David J. H.,Jenkins, Hilary A.,Britten, James F.
scheme or table, p. 8175 - 8189 (2012/08/08)
A rigid NSN-donor proligand, 4,5-bis(2,6-diisopropylanilino)-2,7-di-tert- butyl-9,9-dimethylthioxanthene (H2[TXA2], 1) was prepared by palladium-catalyzed coupling of 2,6-diisopropylaniline with 4,5-dibromo-2,7-di-tert-butyl-9,9-dimethylthioxanthene. Deprotonation of 1 using nBuLi provided Li2(DME)2[TXA2] (2), and subsequent reaction with UCl4 afforded [Li(DME) 3][(TXA2)UCl3] (4). The analogous NON-donor ligated complex [(XA2)UCl3K(DME)3] [3; XA 2 = 4,5-bis(2,6-diisopropylanilino)-2,7-di-tert-butyl-9,9- dimethylxanthene] was prepared by the reaction of K2(DME) x[XA2] with UCl4. A cyclic voltammogram (CV) of 3 in THF/[NBu4][B(C6F5)4] at 200 mV s-1 showed an irreversible reduction to uranium(iii) at E pc = -2.46 V versus FeCp20/+1, followed by a product wave at E1/2 = -1.83 V. Complex 4 also underwent irreversible reduction to uranium(iii) [Epc = -2.56 V], resulting in an irreversible product peak at Epa = -1.83 V. One-electron reduction of complexes 3 and 4 using K(naphthalenide) under an argon atmosphere in DME yielded 6-coordinate [(XA2)UCl(DME)] (5) and the thermally unstable 7-coordinate [(TXA2)U(DME)Cl2Li(DME)2] (6), respectively. The U-S distances in 4 and 6 are uncommonly short, the C-S-U angles are unusually acute, and the thioxanthene backbone of the TXA2 ligand is significantly bent. By contrast, the xanthene backbone in XA 2 complexes 3 and 5 is planar. However, κ3- coordination and an approximately meridional arrangement of the ancillary ligand donor atoms is maintained in all complexes. DFT and Atoms in Molecules (AIM) calculations were carried out on 3, 4, 5, 6, [(XA2)UCl 3]- (3B), [(TXA2)UCl2(DME)] - (6B) and [(TXA2)UCl(DME)] (6C) to probe the extent of covalency in U-SAr2 bonding relative to U-OAr2 bonding.
Chalcogeno-Substituted Bis-triphenylmethylium Ions of the Inverse Malachite Green Type
Hellwinkel, Dieter,Stahl, Heinz
, p. 521 - 538 (2007/10/02)
The longest wavelength VIS absorptions of the deeply colored CF3CO2H solutions of the 4,4'-chalcogenobis-(triphenylmethylium) ions 4(++), Y2 (Y = O, S, Se, Te) resemble closely those of the corresponding monocationic 4-arylchalcogenotriphenylmethylium systems 5(1+), ArYC6H4C(1+)(C6H5)2, and not those of the structurally directly related 4,4'-bis(arylchalcogeno)triphenylmethylium ions 3(1+), C6H5C(1+)(C6H4YAr)2.This is in striking contrast to the results obtained previously for analogous nitrogen systems, where "inverse", 2(++), RN, and "conventional" malachite green systems 1(+), (Ar2NC6H4)2C(1+)R, yield almost identical λmax values.A rationalization of these observations can be achieved based on the assumption of largely delocalized dications 2(++) versus more or less orthogonal "double monocationic" systems 4B(++), separated due to torsional twist.Whereas the formal push-pull systems 6(+), ArSC6H4YC6H4C(1+)(C6H5)2 (Y = O, S, Se) behaved practically like the corresponding standard systems 5(+), the mono- and bis-triphenylmethylthio-substituted dibenzofuran, dibenzothiophene and thioxanthene derivatives 8(+), 9(++), 10(+) and 11(++) displayed hypsochromic shifts of their color bands relative to their noncyclic analogues which are only partly in accordance with predictions based on a simple frontier orbital Hueckel model.The 1H and 13C NMR spectra of all these cationic species comply with their respective charges. +"--"+ Dyes, Chalcogeno-bis-trityliumions, VIS Spectra, NMR Spectra
RING FLATTENING IN THIANTHRENE SULFONIUM BIS(CARBOMETHOXY)METHYLIDES
Ternay, A. L.,South, Bobbie E.,McKellar, R.,Lam, W. W.
, p. 63 - 66 (2007/10/02)
Bis(carbomethoxy)methylides derived from thianthrene 5,5-dioxide and 2,7-dichlorothianthrene 5,5-dioxide exhibited hindered S+-C- bond rotation.Variable temperature NMR studies are described for these ylides as well as 9,9-dimethylthioxanthenium bis(carbomethoxy)methylide.With coalescence temperatures of ca. 30 deg C (200 MHz), all have ΔG ca. 15 kcal/mol.Key words: Thianthrene; ylide; conformation; NMR
