TY - JOUR
T1 - Efficient hybrid white polymer light-emitting devices with electroluminescence covered the entire visible range and reduced efficiency roll-off
AU - Hu, Sujun
AU - Zhu, Minrong
AU - Zou, Qinghua
AU - Wu, Hongbin
AU - Yang, Chuluo
AU - Wong, Wai Yeung
AU - Yang, Wei
AU - Peng, Junbiao
AU - Cao, Yong
N1 - Funding Information:
H.-B.W. thanks National High Technology Research and Development Program 863 (No. 2011AA03A110), National Basic Research Program of China (No. 2009CB623602), National Natural Science Foundation of China (No. 60906032, and 61177022) for the financial support. W.-Y.W. acknowledges the financial support from a General Research Grant from the Hong Kong Research Grants Council (HKBU202709 and HKUST2/CRF/10), a FRG grant from Hong Kong Baptist University (FRG2/10-11/101) and the Areas of Excellence Scheme, University Grants Committee, HKSAR, People’s Republic of China (AoE/P-03/08). C.-L.Y. thanks the National Science Fund for Distinguished Young Scholars of China (No. 51125013) and the National Natural Science Foundation of China (No. 90922020).
PY - 2012/2/6
Y1 - 2012/2/6
N2 - We report efficient hybrid white polymer light emitting devices (WPLEDs) fabricated via simple solution-proceeded process from a newly synthesized wide band-gap fluorene-co-dibenzothiophene-S,S-dioxide copolymer, which dually function as fluorescent blue emitter and host material for electrophosphorescent sky-blue, yellow, and saturated-red dyes. The Commission Internationale d'nclairage coordinates of the best devices are (0.356, 0.334), with electroluminescence covered the entire visible light spectrum from 400 to 780 nm, resulting in a high color rendering index of 90. Incorporation of a bilayer electrode consisting of water/alcohol-soluble conjugated polymer and Al as electron-injection cathode boosts an enhancement of 50% in device efficiency, leading to external quantum efficiency of 12.6%, and peak power efficiency of 21.4 l m W -1 as measured in an integrating sphere. Both the efficiency and the color quality of the obtained device are ranking among one of the highest values for WPLEDs reported to date. Furthermore, as compared with those all-phosphorescent WPLEDs, the hybrid WPLEDs studied here exhibit a significantly reduced efficiency roll-off due to the very low doping concentration.
AB - We report efficient hybrid white polymer light emitting devices (WPLEDs) fabricated via simple solution-proceeded process from a newly synthesized wide band-gap fluorene-co-dibenzothiophene-S,S-dioxide copolymer, which dually function as fluorescent blue emitter and host material for electrophosphorescent sky-blue, yellow, and saturated-red dyes. The Commission Internationale d'nclairage coordinates of the best devices are (0.356, 0.334), with electroluminescence covered the entire visible light spectrum from 400 to 780 nm, resulting in a high color rendering index of 90. Incorporation of a bilayer electrode consisting of water/alcohol-soluble conjugated polymer and Al as electron-injection cathode boosts an enhancement of 50% in device efficiency, leading to external quantum efficiency of 12.6%, and peak power efficiency of 21.4 l m W -1 as measured in an integrating sphere. Both the efficiency and the color quality of the obtained device are ranking among one of the highest values for WPLEDs reported to date. Furthermore, as compared with those all-phosphorescent WPLEDs, the hybrid WPLEDs studied here exhibit a significantly reduced efficiency roll-off due to the very low doping concentration.
UR - http://www.scopus.com/inward/record.url?scp=84863149277&partnerID=8YFLogxK
U2 - 10.1063/1.3682526
DO - 10.1063/1.3682526
M3 - Journal article
AN - SCOPUS:84863149277
SN - 0003-6951
VL - 100
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 6
M1 - 063304
ER -