Overcoming the energy gap law in near-infrared OLEDs by exciton–vibration decoupling
學年 108
學期 2
出版（發表）日期 2020-06-29
作品名稱 Overcoming the energy gap law in near-infrared OLEDs by exciton–vibration decoupling
作品名稱（其他語言）
著者 Yu-Chen Wei; Sheng Fu Wang; 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; Pi-Tai Chou
單位
出版者
著錄名稱、卷期、頁數 Nature Photonics 14, p.570–577
摘要 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 2.14% and a radiance of 41.6 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.
關鍵字
語言 en
ISSN 1749-4893; 1749-4885
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 GBR
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/123411 )