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Liu J.,Shanghai JiaoTong University | Shi X.,Shanghai JiaoTong University | Wu X.,Shanghai JiaoTong University | Wang J.,Shanghai JiaoTong University | And 5 more authors.
Organic Electronics: physics, materials, applications | Year: 2014

High efficiency inverted phosphorescence organic light-emitting diodes (PhOLEDs) based on ultrathin undoped and doped emitting layer (EML) have been developed. Compared to conventional device, the inverted PhOLED with 0.5 nm undoped EML exhibits significantly larger external quantum efficiency (EQE), due to effective energy transfer from the excited host to the emitter. According to the atomic force microscopy image of EML, the 0.5 nm emitter sandwiched by two hosts can be considered as the emitter doped in two hosts. The inverted device with intentionally doped ultrathin EML (1.5 nm) exhibits the maximum EQE of 31.1%, which is attributed to optimized charge balance and preferred horizontal orientation of emitter. However, such inverted device has large efficiency roll-off at high brightness because of triplet-triplet annihilation process within the ultrathin EML. This can be improved by broadening the doped EML. The inverted device with 10.5 nm doped EML has about EQE of 20 % at 10,000 cd/m 2. It is expected that our inverted PhOLED will promote development of high efficiency active-matrix organic light-emitting diodes based on the n-type Indium Gallium Zinc Oxide thin film transistor. © 2014 Elsevier B.V. All rights reserved. Source


Patent
Guangdong Aglaia Optoelectronic Materials Co. and Beijing Aglaia Technology Development Co. | Date: 2013-05-26

The present invention discloses an organic light-emitting device (OLED), comprising an anode, a cathode, and one or more organic layers, wherein the said organic layer contains at least one compound having the formula (I), and the said OLED has the advantages of excellent light-emitting efficiency, excellent color purity and long lifetime.


Patent
Guangdong Aglaia Optoelectronic Materials Co. and Beijing Aglaia Technology Development Co. | Date: 2013-05-26

The present invention discloses an organic light-emitting device (OLED), comprising an anode, a cathode, and one or more organic layers, wherein the said organic layer contains at least one compound having the formula (I), and the said OLED has the advantages of excellent light-emitting efficiency, excellent color purity and long lifetime.


Patent
Guangdong Aglaia Optoelectronic Materials Co. and Beijing Aglaia Technology Development Co. | Date: 2014-04-25

The present invention also relates to an organic electronic material with the structure of formula (I). It is a kind of hole transport and injection material with good thermal stability, high hole mobility and excellent solubility. The OLEDs prepared thereof have the advantages such as good light emitting efficiency, excellent color purity and long lifetime.


Patent
Guangdong Aglaia Optoelectronic Materials Co. and Beijing Aglaia Technology Development Co. | Date: 2014-04-25

The OLED in the present invention comprises an anode, a cathode, and one or multiple organic layers, and the organic layer at least contains one kind of material with the following chemical formula I. The OLEDs made by this organic light emitting material have advantages such as good light emitting efficiency, excellent color purity and long lifetime.

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