White organic light-emitting device
AssigneeIndustrial Technology Research Institute
InventorsMeng-Ting Lee, Miao-Tsai Chu
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Abstract
A white organic light-emitting device is provided by the present invention. The white organic light-emitting device includes an anode, a hole transport layer, a first light-emitting layer, a second light-emitting layer, a third light-emitting layer, an electron transport layer and a cathode, wherein the second light-emitting layer is formed between the first and the third light-emitting layers, the emission wavelength of the second light-emitting layer is longer than that of the first and third light-emitting layers, and the host material of the first and third light-emitting layer are different. The white organic light-emitting device of the present invention is capable of effectively increasing the luminous efficiency, reducing operating voltage, and providing color stability.
Claims19
A white organic light-emitting device, comprising:
- an anode;
- a hole transport layer formed on the anode;
- a first light-emitting layer formed on the hole transport layer, the first light-emitting layer comprising a first host material, a first transition metal organic complex and a carrier transport material;
- a second light-emitting layer formed on the first light-emitting layer, so as to allow the first light-emitting layer to be disposed between the hole transport layer and the second light-emitting layer, and the second light-emitting layer comprising a second transition metal organic complex;
- a third light-emitting layer formed on the second light-emitting layer, so as to allow the second light-emitting layer to be disposed between the first light-emitting layer and the third light-emitting layer, the third light-emitting layer comprising a third host material, the first transition metal organic complex and the carrier transport material;
- an electron transport layer formed on the third light-emitting layer, so as to allow the third light-emitting layer to be disposed between the second light-emitting layer and the electron transport layer;
- and
- a cathode formed on an outer surface of the electron transport layer,
- wherein the emission wavelength of the second light-emitting layer is longer than that of the first light-emitting layer and third light-emitting layer, and the first host material is different from the third host material,
- wherein the carrier transport material is one selected from one represented by formulae (I) and (II):
- wherein Ar1, Ar2 and Ar3 are independently selected from C6-C10 aryl group or C6-C10 aryl group substituted by 1 to 3 substituents, wherein the substituents are independently selected from C1-C6 alkyl group, C1-C6 alkoxy group, C1-C6 alkylamino group, N-carbazolyl group or 9-phenylfluorene-9-yl;
- and
- L is independenty selected from a single covalent bond, C3-C10 cycloalkyl group, silica, or mono- or di-phenylsilyl.
Dependencies are inferred from the claim text.