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ACS Appl Mater Interfaces. 2016 Aug 17;8(32):20955-61. doi: 10.1021/acsami.6b07563. Epub 2016 Aug 2.

Highly Efficient Nondoped Organic Light Emitting Diodes Based on Thermally Activated Delayed Fluorescence Emitter with Quantum-Well Structure.

Meng L1,2, Wang H1,2, Wei X1,2, Liu J1,2, Chen Y1,2, Kong X1,2, Lv X3, Wang P1, Wang Y1.

Author information

1
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
2
University of Chinese Academy of Sciences , Beijing 100049, China.
3
Soochow University , Suzhou, Jiangsu Province, China.

Abstract

Highly efficiency nondoped thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs) with multiquantum wells structure were demonstrated. By using an emitting layer with seven quantum wells, the nondoped TADF OLEDs exhibit high efficiency with EQE of 22.6%, a current efficiency of 69 cd/A, and a power efficiency of 50 lm/W, which are higher than those of the conventional doped OLED and among the best of the TADF OLEDs. The high performance of the devices can be ascribed to effective confinement of the charges and excitons in the emission layer by the quantum well structure. The emission layer with multiquantum well structure is demonstrated to be cost effective for highly efficient nondoped TADF OLEDs and holds great potential for organic electronics.

KEYWORDS:

TXO-PhCz; nondoped; organic light emitting diodes; quantum-well structure; thermally activated delayed fluorescence

PMID:
27452075
DOI:
10.1021/acsami.6b07563

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