Real-time interface investigation on degradation mechanism of organic light-emitting diode by in-operando X-ray spectroscopies

Nie, Kaiqi; Zhang, Hui; McLeod, John A.; Zhang, Duo; Zhou, Dongying; Xia, Yujian; Zhong, Jun; Liao, Liangsheng; Guo, Jinghua; Sun, Xuhui

doi:10.1016/j.orgel.2020.105901

Real-time interface investigation on degradation mechanism of organic light-emitting diode by in-operando X-ray spectroscopies

Journal Article · Sat Aug 15 00:00:00 EDT 2020 · Organic Electronics

DOI:https://doi.org/10.1016/j.orgel.2020.105901· OSTI ID:1838425

Nie, Kaiqi ^[1]; Zhang, Hui ^[2]; McLeod, John A. ^[3]; Zhang, Duo ^[3]; Zhou, Dongying ^[3]; Xia, Yujian ^[3]; Zhong, Jun ^[3]; Liao, Liangsheng ^[3]; Guo, Jinghua ^[4]; Sun, Xuhui ^[3]

Soochow Univ., Suzhou (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Soochow Univ., Suzhou (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chinese Academy of Sciences, Shanghai (China)
Soochow Univ., Suzhou (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)

Understanding the chemical evolution at the interface of organic light-emitting diodes (OLEDs) under working conditions is critical for addressing device failure and further improving performance. In this work, an in-operando approach was developed employing synchrotron-based X-ray absorption spectroscopy (XAS) to investigate the electronic structures and chemical degradation mechanisms of a model tris(8-hydroxyquinoline) aluminum (Alq₃)-based OLED device under working condition. The results identify that Mg atoms from the electrode migrate into the Alq₃ organic layer under a potential bias and replace Al atom sites, forming the unstable Mgq₃ species which lead to device degradation. Here, the findings from the classic and simple model device elucidate the degradation mechanisms occurred at the interface of OLED devices, which may facilitate the development of more efficient and stable OLED devices with complex structures.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1838425

Journal Information:: Organic Electronics, Journal Name: Organic Electronics Vol. 87; ISSN 1566-1199

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Degradation mechanism
In-operando
Interface interaction
Organic light-emitting diode
X-ray absorption spectroscopy

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