The invention relates to a thermal activation delayed fluorescent material with a general formula of the structure shown as the formula (I) or the formula (II). D is one of phenoxazinyl, phenothizainyl, 9,9-dimethyl acridine, 9-methyl phenazinyl, 9-phenyl phenazinyl, 4-phenoxazinyl-1-phenyl, 4-phenothizainyl-1-phenyl, 4-(9,9-dimethyl)acridinyl-1-phenyl, 4-(9-methyl)-phenazinyl-1-phenyl, 4-(9-phenyl)phenazinyl-1-phenyl and 3,5-bis-carbazolyl-1-phenyl. The invention further relates to an organic electroluminescent device which comprises a light-emitting layer, and luminescent dye of the light-emitting layer is the thermal activation delayed fluorescent material. The singlet state-triplet state energy gap (delta EST) of the thermal activation delayed fluorescent material is very small, triplet state excitors can be converted into singlet state excitors through inverse intersystem crossing (RIST) to emit light, and the efficiency and stability of an OLED device can be improved. The formula is shown in the description.

Thermal activation delayed fluorescent material and organic electroluminescent device

The invention discloses a compound based on disubstituted-9-fluorenone and application thereof. The compound takes disubstituted-9-fluorenone as a mother nucleus, and two sides of disubstituted-9-fluorenone are connected with two aromatic heterocyclic groups, so that the crystallization of molecules is destroyed, aggregation between the molecules is avoided, and excellent film forming property is achieved. When applied to an OLED as a luminescent layer material, the compound has favorable photoelectric property.

Compound based on monosubstituent-9-fluorenone and application thereof

The invention discloses a compound based on 1,8-diazafluoren-9-one and an application of the compound. According to the compound, the 1,8-diazafluoren-9-one is used as a mother nuclide, and two aromatic heterocyclic groups are connected to two sides of the 1,8-diazafluoren-9-one, so that crystallinity of molecules is destroyed, aggregation between the molecules is avoided, and good film forming performance is obtained. The compound disclosed by the invention is used as a luminescent layer material to be applied to an organic electroluminescent device, and the organic electroluminescent device applying the compound has favorable photoelectric properties and can meet requirements of panel manufacturing enterprises.

Compound based on 1,8-diazafluoren-9-one and application of compound

The invention discloses an organic electroluminescent material with 9-fluorenone as a core and an application thereof. With the 9-fluorenone as the core, molecules of the compound are not liable to crystallize and aggregate and the compound has excellent film forming property. The compound is used on organic light emitting diodes as a luminescent layer material. The compound has excellent photoelectric performance and can satisfy application requirements of panel manufacturers better.

Organic electroluminescent material with 9-fluorenone as core and application thereof

The invention discloses a dual-substituent-group-9-fluorenone compound-containing organic light-emitting device and an application thereof. The device comprises a hole transport layer, a light emitting layer and an electron transfer layer; the light emitting layer of the device adopts the material of the dual-substituent-group-9-fluorenone-group-containing compound which is as shown in the general formula (1). The adopted dual-substituent-group-9-fluorenone-group compound has relatively low triplet state and singlet state energy difference, so that energy transfer between host-guest materials can be realized easily; therefore, energy which is originally dissipated in a heat form can be obtained and utilized easily, thereby obtaining high efficiency of a device more easily; and furthermore, when a fluorescent material is selected as a doping material, the light emitting radiation of the doping material can be obtained more easily, thereby achieving long service life of the material more easily.

Dual-substituent-group-9-fluorenone compound-containing organic light-emitting device and application thereof

2,7-di-(N-phenothiazinyl)fluorenone and preparation method thereof

The invention discloses a carbazolyl-based organic electroluminescence compound which has the structural general formula shown by formula (I), wherein R is H, CH3 or CH2CH3. The organic electroluminescence compound disclosed by the invention is used as phosphorescent host material in an organic electrophosphorescent device, and has good electronic transmission characteristic and thermal stability; and meanwhile, the host material has relatively high triplet state energy level and can effectively prevent back transfer of triplet state energy so as to improve the luminous efficiency and prolong the service life of the organic electrophosphorescent device.

Carbazolyl-based organic electroluminescence compound

The invention discloses a method for coating silicon dioxide on the surface of 8-hydroxyquinoline aluminum. The method comprises the following steps of: dropwise adding an aqueous solution of aluminum sulfate and a tetraethoxysilane absolute ethyl alcohol solution into an 8-hydroxyquinoline absolute ethyl alcohol solution into which a catalyst triethylamine is added in a molar ratio of 8-hydroxyquinoline to aluminum sulfate to tetraethoxysilane being 6:1:(1-10) at the same time, and reacting to obtain yellow-green 8-hydroxyquinoline aluminum of which the surface is coated with silicon dioxide. The method for coating silicon dioxide on the surface of the 8-hydroxyquinoline aluminum is quick, simple and convenient to operate and mild in reaction condition. By adopting the method, the 8-hydroxyquinoline aluminum of which the surface is coated with silicon dioxide can be obtained conveniently and quickly, and the luminescence characteristic of the 8-hydroxyquinoline aluminum of which the surface is coated with silicon dioxide is similar to that of 8-hydroxyquinoline aluminum.

Wu Yuling

Papers

2,7-di-(N-phenothiazinyl)fluorenone and preparation method thereof

Carbazolyl-based organic electroluminescence compound

Method for coating silicon dioxide on surface of 8-hydroxyquinoline aluminum