TY - JOUR
T1 - Managing Excitons and Charges for High-Performance Fluorescent White Organic Light-Emitting Diodes
AU - Wu, Zhongbin
AU - Wang, Qi
AU - Yu, Ling
AU - Chen, Jiangshan
AU - Qiao, Xianfeng
AU - Ahamad, Tansir
AU - Alshehri, Saad M.
AU - Yang, Chuluo
AU - Ma, Dongge
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/10/26
Y1 - 2016/10/26
N2 - The simultaneous realization of high efficiency, stable spectra, high color rendering index (CRI), and low-efficiency roll-off in a fluorescent white organic light-emitting diode (WOLED) still remains a big challenge. Here, we demonstrate high-performance conventional fluorescent-dopant-based WOLEDs by strategic management of singlet and triplet excitons within an efficient emissive zone. This design consists of two separated red/green sub-EMLs with ultralow doping concentration and a sandwiched sub-EML doped with red and green fluorescent dyes at a relatively high concentration, which can harness all electrogenerated excitons and reduce the energy loss to the utmost extent. Accordingly, the resulting WOLED realizes an external quantum efficiency (EQE) of 18.2% with a maximum power efficiency of 44.6 lm W-1. At the practical luminance of 1000 cd m-2 for the lighting source, the EQE still remains as high as 16.2% with a CRI of 82 and stable color spectra. A comprehensive understanding of the device working mechanism is performed to guide design of efficient and stable fluorescent WOLEDs.
AB - The simultaneous realization of high efficiency, stable spectra, high color rendering index (CRI), and low-efficiency roll-off in a fluorescent white organic light-emitting diode (WOLED) still remains a big challenge. Here, we demonstrate high-performance conventional fluorescent-dopant-based WOLEDs by strategic management of singlet and triplet excitons within an efficient emissive zone. This design consists of two separated red/green sub-EMLs with ultralow doping concentration and a sandwiched sub-EML doped with red and green fluorescent dyes at a relatively high concentration, which can harness all electrogenerated excitons and reduce the energy loss to the utmost extent. Accordingly, the resulting WOLED realizes an external quantum efficiency (EQE) of 18.2% with a maximum power efficiency of 44.6 lm W-1. At the practical luminance of 1000 cd m-2 for the lighting source, the EQE still remains as high as 16.2% with a CRI of 82 and stable color spectra. A comprehensive understanding of the device working mechanism is performed to guide design of efficient and stable fluorescent WOLEDs.
KW - conventional fluorescent dopant
KW - exciton management
KW - fluorescent white organic light-emitting diodes
KW - high performance
KW - host-guest synergistic effect
UR - http://www.scopus.com/inward/record.url?scp=84994018010&partnerID=8YFLogxK
U2 - 10.1021/acsami.6b10087
DO - 10.1021/acsami.6b10087
M3 - 文章
AN - SCOPUS:84994018010
SN - 1944-8244
VL - 8
SP - 28780
EP - 28788
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 42
ER -