37 results about "Excited singlet" patented technology

In one embodiment of the present invention an oxygen iodine laser includes a gas mixing section. Ground state oxygen and a carrier gas are introduced into the first gas mixing section, sometimes separately. The laser includes a discharge region to generate at least said excited oxygen from the flow of the first gas mixing section. A sensitizer gas having a lower ionization threshold than ground state oxygen is also introduced into the first gas mixing section, such that electrons are more easily produced in the electrical generator. The laser system includes introducing a source of iodine into the excited singlet delta oxygen flow to generate a laser-active gas. In another embodiment a conditioner is placed into the gas mixing section to help mix the flow and / or introduce one or more of the aforementioned gases.

The invention relates to neutral mononuclear copper (I) complexes for emitting light and with a structure according to formula (A) in which: M represents: Cu(I); L∩L represents: a single, negatively charged, bidentate ligand; N∩N represents: a diimine ligand (substituted with R and FG), in particular a substituted 2,2′-bipyridine derivative (bpy) or a substituted 1,10-phenanthroline derivative (phen); R represents: at least one sterically demanding substituent for preventing the planarization of the complex in the excited state; FG=functional group, and represents: at least one second substituent for increasing solubility in organic solvents. The substituent can also be used for electron transport or alternatively for hole transport, said functional group being bound to the diimine ligands either directly or by means of suitable bridges; and the copper (I) complex: having a ΔE(S1−T1) value of less than 2500 cm−1 between the lowest excited singlet state (S1) and the triplet state (T1) which lies below; having an emission lifespan of at most 20 μs; having an emission quantum yield of greater than 40%, and a solubility of at least 1 g / L in organic solvents, in particular polar organic hydrocarbons such as acetone, methyl ethyl ketone, benzene, toluene, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, dichloroethane, tetrachloroethylene, alcohols, acetonitrile or water.

A delayed fluorescence material containing a mixture of an acceptor compound and a donor compound that satisfies the following formulae (1) to (4):T1A−S1>0.2 eV  (1)T1D−S1≧0.2 eV  (2)|LUMOA|>2.0 eV  (3)|HOMOD|≦5.3 eV  (4)wherein T1A represents the excited triplet energy of the acceptor compound; T1D represents the excited triplet energy defined of the donor compound; S1 represents the excited singlet energy of the exciplex; LUMOA represents the energy level of LUMO of the acceptor compound; and HOMOD represents the energy level of HOMO of the donor compound.

The present invention provides a heat-induced delayed fluorescence compound and its preparation method and application. The compound provided by the present invention has a structure shown in formula (I). The present invention introduces a substituted aromatic group at the 1,8 positions of carbazole, and at the same time The other positions of the carbazole are supplemented with specific groups, so that the obtained compound has a small energy level difference between the first excited singlet state and the first excited triplet state, thereby realizing effective delayed fluorescence. Moreover, the photoluminescent efficiency of the compound is higher in the solid state, which is conducive to the full utilization of the triplet excitons. When the compound is applied to electroluminescent devices, it can break through the 5% external quantum efficiency limit of traditional fluorescent materials.

A thermally activated delayed fluorescence (TADF) molecule comprising: a central electron donor moiety, wherein the central electron donor moiety is formed of a conjugated multi-ring system comprisingthree nitrogen atoms; and three electron acceptor moieties, each bonded to the central electron donor moiety via one of the three nitrogen atoms, wherein at least one of the three electron acceptor moieties is twisted relative to the central electron donor moiety defining a torsion angle in a range 40 degrees to <90 degrees whereby the TADF molecule has a photoluminescence quantum yield of >60% and a rate of reverse intersystem crossing from a lowest excited triplet state to a lowest excited singlet state of at least 1*10<6> s<-1>.

Novel hydrocarbons which are excellent in heat resistance and light resistance and in solubility in organic solvents and which exhibit high energy levels of excited singlet and triplet states and wide electric oxidation-reduction potentials have partial structures represented by the general formula (I) in the molecule: (I) wherein G is a substituent represented by the general formula (II); and R<1> and R<2> are each independently an arbitrary hydrocarbon group, with the proviso that the benzene ring to which R<1>, R<2> and G are bonded has no substituent except R<1>, R<2> and G: (II) wherein R<3> to R<5> are each independently hydrogen or an arbitrary hydrocarbon group, with the proviso that the terphenyl group in the general formula (II) has no substituent except R<3> to R<5>.

An organic light emitting device having an exciton generation layer that contains a compound having a difference between the lowest excited singlet energy level ES1 and the lowest excited triplet energy level ET1 thereof of 0.3 eV or less, or an exciplex to emit delayed fluorescence, and a light emitting layer that contains a light emitting material has a high efficiency and a long lifetime.

The invention relates to a composition having an organic emitter molecule, which has a ΔE(S1−T1) value between the lowest excited singlet state (S1) and the triplet state thereunder of less than 3000 cm−1 and an atom or molecule for reducing the intersystem crossing time constant of the organic molecule.