Kyushu University

Kyulux, Inc.

Ping Kuen Daniel Tsang

Chihaya Adachi

Ayataka Endo

Hiroko Nomura

Hajime Nakanotani

Yoshitake Suzuki

Naoto Notsuka

Hayato Kakizoe

Keiro Nasu

Hiroki Noda

Asuka Yoshizaki

Makoto Yoshizaki

Kiyomasa Sueishi

Junji Adachi

Hidetoshi Fujimura

An organic light-emitting device having an organic mixed layer that contains a first organic compound and a second organic compound and a third organic compound satisfying E(A)>E(B)>E(C). E(A), E(B) and E(C) each represent a lowest excited singlet energy level of the first organic compound, the second organic compound and the third organic compound, respectively. The second organic compound and the third organic compound are delayed fluorescent materials. The invention provides an organic light-emitting device having a long lifetime and a high light emission efficiency.

Organic light emitting element

An organic electroluminescent device having an anode, a cathode, and a light-emitting layer between the anode and the cathode, wherein the light-emitting layer contains at least a first organic compound, a second organic compound and a third organic compound satisfying the following formula (A), the second organic compound is a delayed fluorescent material, and the third organic compound is a light-emitting material, has a high light emission efficiency. Formula (A): E(A)>E(B)>E(C) wherein E(A), E(B) and E(C) each represent a lowest excited singlet energy level of the first organic compound, the second organic compound and the third organic compound, respectively.

Organic electroluminescence element

An organic electroluminescent device having a structure of at least an anode, a light-emitting layerand a cathodelayered in that order, wherein the light-emitting layercontains a first host material, a second host material and a light-emitting material of a dopant, and both the first host material and the second host material have a lowest excited triplet energy level higher than the lowest excited triplet energy level of the light-emitting material. The device is protected from performance deterioration with time in driving and has a long lifetime.

Organic electroluminescent device

An organic light emitting device having an exciton generation layer that contains a compound having a difference between the lowest excited singlet energy level Eand the lowest excited triplet energy level Ethereof 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.

Organic light-emitting device

An organic electroluminescent device having a structure of at least an anode, a light-emitting layer, an electron transporting layerand a cathodelayered in that order, and having a charge trap concentration reducing layerin the interface between the light-emitting layerand the electron transporting layercan suppress performance deterioration with time in driving to prolong the lifetime thereof.

Growing community of inventors

Fukuoka, Japan

Ping Kuen Daniel Tsang