Journal ArticleDOI
Overcoming the energy gap law in near-infrared OLEDs by exciton–vibration decoupling
Yu-Chen Wei,Sheng Fu Wang,Yun Hu,Yun Hu,Liang-Sheng Liao,Deng-Gao Chen,Kai-Hsin Chang,Chi-Wei Wang,Shih-Hung Liu,Wei-Hsiang Chan,Jia-Ling Liao,Wen-Yi Hung,Tsai-Hui Wang,Po-Ting Chen,Hsiu-Fu Hsu,Yun Chi,Yun Chi,Pi-Tai Chou +17 more
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TLDR
In this article, exciton delocalization, which serves to decouple the exciton band from highly vibrational ladders in the ground state, can bring substantial enhancements in the photoluminescence quantum yield of emitters, bypassing the energy gap law.Abstract:
The development of high-performance near-infrared organic light-emitting diodes is hindered by strong non-radiative processes as governed by the energy gap law Here, we show that exciton delocalization, which serves to decouple the exciton band from highly vibrational ladders in the S0 ground state, can bring substantial enhancements in the photoluminescence quantum yield of emitters, bypassing the energy gap law Experimental proof is provided by the design and synthesis of a series of new Pt(ii) complexes with a delocalization length of 5–9 molecules that emit at 866–960 nm with a photoluminescence quantum yield of 5–12% in solid films The corresponding near-infrared organic light-emitting diodes emit light with a 930 nm peak wavelength and a high external quantum efficiency up to 214% and a radiance of 416 W sr−1 m−2 Both theoretical and experimental results confirm the exciton–vibration decoupling strategy, which should be broadly applicable to other well-aligned molecular solids Pt(ii) complexes allow the fabrication of efficient near-infrared organic light-emitting diodes that operate beyond the 900 nm regionread more
Citations
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Journal ArticleDOI
Multi-Resonance Deep-Red Emitters with Shallow Potential-Energy Surfaces to Surpass Energy-Gap Law**
Yuewei Zhang,Dongdong Zhang,Tianyu Huang,Alexander J. Gillett,Yang Liu,Deping Hu,Lin-Song Cui,Zhengyang Bin,Guomeng Li,Jinbei Wei,Lian Duan +10 more
TL;DR: In this paper, multiple boron (B)-and nitrogen (N)-atoms embedded polycyclic heteroaromatics featuring hybridized π-bonding/non-bond molecular orbitals are constructed, providing a way to overcome the above luminescent boundary.
Journal ArticleDOI
Renewed Prospects for Organic Photovoltaics.
Guichuan Zhang,Francis Lin,Feng Xiao Qi,Thomas Heumüller,Andreas Distler,Hans-Joachim Egelhaaf,Ning Li,Philip C. Y. Chow,Christoph J. Brabec,Alex K.-Y. Jen,Hin-Lap Yip +10 more
TL;DR: The development and application of NFAs with an A-D-A configuration (where A = acceptor and D = donor) has enabled devices to have efficient charge generation and small energy losses (Eloss < 0.6 eV), resulting in substantially higher power conversion efficiencies (PCEs) than FA-based devices as discussed by the authors .
Journal ArticleDOI
Advances in solution-processed near-infrared light-emitting diodes
Maria Vasilopoulou,Azhar Fakharuddin,F. Pelayo García de Arquer,F. Pelayo García de Arquer,Dimitra G. Georgiadou,Dimitra G. Georgiadou,Hobeom Kim,Abd. Rashid bin Mohd Yusoff,Feng Gao,Mohammad Khaja Nazeeruddin,Henk J. Bolink,Edward H. Sargent +11 more
TL;DR: In this article, a summary of recent advances in the near-infrared light-emitting diodes that are fabricated by solution-processed means, with coverage of devices based on organic semiconductors, halide perovskites and colloidal quantum dots.
Journal ArticleDOI
Low Band Gap Conjugated Semiconducting Polymers
Journal ArticleDOI
Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors
Yan Zhang,Shihai Miao,Ya-Xuan Liang,Chao Liang,Dongxun Chen,Xihui Shan,Kangning Sun,Xiaojing Wang +7 more
TL;DR: In this article , a series of SWIR-emitting materials with high luminescence efficiency and excellent thermal stability were developed by co-doping Cr 3+ -Yb 3+ ion pairs into Lu 0.2 Sc 0.8 BO 3 host materials.
References
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