113 results about "Intersystem crossing" patented technology

Organic light emitting devices are described wherein the emissive layer comprises a host material containing a fluorescent or phosphorescent emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, wherein an intersystem crossing molecule of optical absorption spectrum matched to the emission spectrum of the emissive molecule enhances emission efficiency.

The invention discloses an organic light-emitting device. According to the organic light-emitting device, a TADF material is used as a first host material of a green light unit to sensitize a green phosphorescent material used as a first guest material. Partial triplet excitons are subjected to reverse intersystem crossing to singlet excitons. The concentration of the triplet excitons decreases to enable a recombination region to become narrow, which avoids the diffusion of the triplet excitons to a blue light layer to emit light so as to realize that the green spectrum does not contain a blue light component. Because the energy level difference between the red light and the blue light is relatively large, and current carriers in the red light are not liable to spread into the blue light, the blue light component is not liable to appear in the red spectrum. Therefore, the red / green subpixel emission spectrum in a blue-light-layer-shared organic light-emitting device does not contain the blue light, which can effectively enlarge the combination selection range of luminescent materials and improve the display performance of the device. In addition, there is no need for providing a hole blocking layer, and the device structure is effectively simplified, so that operating voltage is reduced; and meanwhile, the difficulty of the process is reduced, and product yield is improved, so that production cost is reduced.

The invention discloses an electroluminescent device which comprises a substrate, an anode, a cavity transmission layer, an electron donor layer, an electron acceptor layer, an inorganic luminescent layer, an electron transmission layer and a cathode successively, and an organic electron donor molecule carried by the electron donor layer and an organic electron acceptor molecule carried by the electron acceptor layer form an interface exciplex. The electron donor layer and electron acceptor layer are additionally arranged to form the interface exciplex as the main body, triplet-state excitonsof the interface exciplex can be converted into singlet excitons via reverse intersystem crossing, and the singlet excitons are sensitized into the inorganic luminescent layer as an object via a fluorescence resonance energy transduction manner to emit light, and the light emitting efficiency can be improved.

Provided is a cyclometalated transition metal complex represented by Formula 1, Formula 2 or Formula 3:By including a new ancillary ligand, the cyclometalated transition metal complex can efficiently emit red light using a phosphor by intersystem crossing (ISC) of excitons to triplet states and then metal to ligand charge transfer (MLCT). An organic light emitting device prepared using the transition metal compound shows high luminous efficiency and high external quantum efficiency.

The invention provides a compound, a display panel comprising the compound and electronic equipment. The compound is provided with a structure shown in the formula I, wherein X<1> and X<2> are respectively selected from O, S and N, D<1> and D<2> refer to electron-donating groups, and A<1> and A<2> refer to electron-accepting groups. The display panel comprises an OLED device, wherein the OLED device comprises an anode, a cathode and at least one organic thin film layer located between the anode and the cathode; each organic thin film layer comprises a luminous layer; each luminous layer comprises the compound; and the compound is used as a main material or a doped material or a co-doped material. According to the compound, through molecular structure design, delta(EST) is lowered, an efficient reverse intersystem crossing process is realized, and the compound has typical TADF characteristics; and when the compound is used as a luminous layer material of the OLED device, the luminous efficiency of the OLED device can be improved, and the working life of the OLED device can be prolonged.

The invention provides a dark blue light thermally activated delayed fluorescence (TADF) material. Compound molecules formed by the dark blue light thermally activated delayed fluorescence material have ultra-high reverse intersystem crossing rate, when the dark blue light thermally activated delayed fluorescence material which serves as a main body is doped into a luminous layer in an electroluminescent device, blue fluorescence and phosphorescence electroluminescent devices which take the dark blue light thermally activated delayed fluorescence material as a main body material have quite high efficiency.