High-Performance Non-doped Blue OLEDs based on Efficiently Triplet-Triplet Upconversion and Aggregation-induced Emission Article Swipe

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Pengbo Han , Cheng‐Wei Lin , Kaojin Wang , Yanping Qiu , Haozhong Wu , Dongge Ma , Anjun Qin , Ben Zhong Tang ·

YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.26434/chemrxiv.13550579

Triplet-triplet upconversion (TTU), where two low-energy triplet excitons are converted to one higher energy singlet exciton, is excellent approach to break through the theoretical limit of the pure ﬂuorescent organic light-emitting diodes (OLEDs) by 5%. To data, however, the reported emitters with high emission efficiency and efficiently TTU in film state are rare. Herein, we design the blue aggregation-induced emission luminogens (AIEgens) and investigate their upconversion efficiency. TPA-An-mPhCz can not only achieve high emission efficiency in the film state, but also show high upconversion efficiency of close to 50% even though the calculated energy level of the triplet excitons (T₂) is lower than 2T₁. A possible upconversion mechanism is proposed according to the transient electroluminescence spectra and theoretical calculation. This strategy may provide a new platform for the construction of highly efficient non-doped blue OLEDs based on TTU and AIEgens.

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Condensed Matter Physics

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Photon upconversion OLED Electroluminescence Exciton Materials science Optoelectronics Doping Singlet state Diode Triplet state Photochemistry Chemistry Nanotechnology Atomic physics Physics Excited state Condensed matter physics Layer (electronics)

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Type: preprint
Language: en
Landing Page: https://doi.org/10.26434/chemrxiv.13550579
PDF: https://chemrxiv.org/engage/api-gateway/chemrxiv/assets/orp/resource/item/60c75415f96a0085032885b1/original/high-performance-non-doped-blue-ole-ds-based-on-efficiently-triplet-triplet-upconversion-and-aggregation-induced-emission.pdf
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DOI: https://doi.org/10.26434/chemrxiv.13550579

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Title: High-Performance Non-doped Blue OLEDs based on Efficiently Triplet-Triplet Upconversion and Aggregation-induced Emission

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Type: preprint

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Language: en

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Publication year: 2021

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Publication date: 2021-01-20

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Authors: Pengbo Han, Cheng‐Wei Lin, Kaojin Wang, Yanping Qiu, Haozhong Wu, Dongge Ma, Anjun Qin, Ben Zhong Tang

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Landing page: https://doi.org/10.26434/chemrxiv.13550579

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PDF URL: https://chemrxiv.org/engage/api-gateway/chemrxiv/assets/orp/resource/item/60c75415f96a0085032885b1/original/high-performance-non-doped-blue-ole-ds-based-on-efficiently-triplet-triplet-upconversion-and-aggregation-induced-emission.pdf

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Concepts: Photon upconversion, OLED, Electroluminescence, Exciton, Materials science, Optoelectronics, Doping, Singlet state, Diode, Triplet state, Photochemistry, Chemistry, Nanotechnology, Atomic physics, Physics, Excited state, Condensed matter physics, Layer (electronics)

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