Achieving High Efficiency at High Luminance in Fluorescent Organic Light‐Emitting Diodes through Triplet–Triplet Fusion Based on Phenanthroimidazole‐Benzothiadiazole Derivatives

Tang, Xiangyang; Liu, Hui; Xu, Lei; Xu, Xuehui; He, Xin; Liu, Futong; Chen, Jianwu; Peng, Qiming

doi:10.1002/chem.202102136

Cited by 7 publications

(3 citation statements)

References 65 publications

(93 reference statements)

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“…As discussed previously, there are several approaches to design high efficiency materials with NIR emitting through utilizing triplet energy. One of these is to harness the triplet excitons of organic fluorescent materials involves triplet fusion (TF) [ 133 , 134 , 135 ]. The theoretical maximum singlet exciton production yield through TF is 50%, which would contribute a maximum radiative exciton ratio of up to 62.5%.…”

Section: Nir Phosphorescent Materials Based On Small Moleculesmentioning

confidence: 99%

Progresses and Perspectives of Near-Infrared Emission Materials with “Heavy Metal-Free” Organic Compounds for Electroluminescence

et al. 2022

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Organic/polymer light-emitting diodes (OLEDs/PLEDs) have attracted a rising number of investigations due to their promising applications for high-resolution fullcolor displays and energy-saving solid-state lightings. Near-infrared (NIR) emitting dyes have gained increasing attention for their potential applications in electroluminescence and optical imaging in optical tele-communication platforms, sensing and medical diagnosis in recent decades. And a growing number of people focus on the “heavy metal-free” NIR electroluminescent materials to gain more design freedom with cost advantage. This review presents recent progresses in conjugated polymers and organic molecules for OLEDs/PLEDs according to their different luminous mechanism and constructing systems. The relationships between the organic fluorophores structures and electroluminescence properties are the main focus of this review. Finally, the approaches to enhance the performance of NIR OLEDs/PLEDs are described briefly. We hope that this review could provide a new perspective for NIR materials and inspire breakthroughs in fundamental research and applications.

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Section: Nir Phosphorescent Materials Based On Small Moleculesmentioning

confidence: 99%

Progresses and Perspectives of Near-Infrared Emission Materials with “Heavy Metal-Free” Organic Compounds for Electroluminescence

et al. 2022

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“…Some high‐efficiency OLEDs employing TTA‐enabling emitters have been successfully demonstrated. [ 10 ] Of particular interest are the anthracene derivatives [ 11 ] with strong TTA behavior. These organic emitters can achieve highly efficient deep‐blue emission with Commission International de L’Eclairge (CIE) coordinates y < 0.1, which is otherwise rather difficult to attain using phosphorescent and TADF emitters.…”

Section: Introductionmentioning

confidence: 99%

“…To realize an efficient inter‐TTA mechanism, an effective collision between triplet excitons is necessary. This causes the demand of high doping concentration, making the risk of concentration quenching (CQ) that limits the device efficiency and perhaps reduces the electroluminescence (EL) color purity due to the undesired intermolecular interactions [10c,12] . Also, most of the reported organic materials possessing TTA characteristics are polycyclic aromatic hydrocarbon compounds, [ 13 ] giving less flexibility for modulating the frontier orbital energy levels.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Deep‐Blue OLEDs Harnessing Triplet–Triplet Annihilation Under Low Dopant Concentration

Chen

Fang

et al. 2022

Advanced Photonics Research

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Organic blue emitters capable of proceeding triplet–triplet annihilation (TTA) are of great importance for high‐efficiency blue organic light‐emitting diodes (OLEDs). Herein, two deep‐blue emitters PAPE and PAPF with two diphenylanthracene (DPA) moieties linked by fluorene and ether, respectively, together with a single DPA model emitter PAPES are synthesized and characterized. Theoretical calculations indicate that the TTA mechanism of these materials is energetically favorable, which is evidenced by platinum octaethylporphyrin‐sensitized TTA‐upconversion (UC) study. The OLED devices employing o‐DiCbzBz host doped with a low concentration of (1%) PAPE and (3%) PAPF furnish superior maximum external quantum efficiency (EQEmax) up to 7.3% and 7.2% and realize deep‐blue emissions with Commission International de L’Eclairge (CIE) coordinates of (0.15, 0.05) and (0.15, 0.04), respectively, that outperform the model device doped with (1%) PAPES with EQEmax 4.12%. The delayed emission lifetimes from TTA of PAPE‐ and PAPF‐doped devices observed by the time‐resolved electroluminescence (EL) analyses are rather short. Fast TTA is observed with magneto‐electroluminescence, supporting the possibility of intramolecular TTA operation in the devices. This work manifests the potential of multichromophoric strategy to design fluorescent emitters that is able to boost the efficiency of deep‐blue OLEDs even with a low doping concentration.

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Highly efficient non-doped organic light emitting diodes based on phenanthreneimidazole derivatives with hot exciton mechanism

Ge,

Du,

Cheng

et al. 2024

Chemical Engineering Journal

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Achieving High Efficiency at High Luminance in Fluorescent Organic Light‐Emitting Diodes through Triplet–Triplet Fusion Based on Phenanthroimidazole‐Benzothiadiazole Derivatives

Cited by 7 publications

References 65 publications

Progresses and Perspectives of Near-Infrared Emission Materials with “Heavy Metal-Free” Organic Compounds for Electroluminescence

Progresses and Perspectives of Near-Infrared Emission Materials with “Heavy Metal-Free” Organic Compounds for Electroluminescence

High‐Performance Deep‐Blue OLEDs Harnessing Triplet–Triplet Annihilation Under Low Dopant Concentration

Highly efficient non-doped organic light emitting diodes based on phenanthreneimidazole derivatives with hot exciton mechanism

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