Hybridized local and charge-transfer excited state fluorophores enabling organic light-emitting diodes with record high efficiencies close to 20%

Liu, Tiantian; Chen, Xiaojie; Zhao, Juan; Wei, Weichun; Mao, Zhu; Wu, William; Jiao, Shibo; Liu, Yang; Yang, Zhiyong; Chi, Zhenguo

doi:10.1039/d1sc00272d

Cited by 92 publications

(66 citation statements)

References 26 publications

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“…HLCT or hot exciton mechanisms can also be used to upconvert triplet excitons into singlet excitons within the ns scale time range. [37][38][39][40][41][42][43][44] High-lying excited states can contribute to the quick exciton conversion, providing high external quantum efficiency (EQE) over 10% in the nondoped blue OLEDs. However, the exciton utilization efficiency (EUE) of the devices operated by the hot exciton mechanism needs to be further enhanced to reach a high EQE.…”

Section: Doi: 101002/adom202200256mentioning

confidence: 99%

Nearly 100% Exciton Utilization via Hybridized Inter‐ and Intramolecular Triplet Exciton Harvesting Channels in Blue Fluorescent Organic Light‐Emitting Diodes

Lee

Patil

Lim

et al. 2022

Advanced Optical Materials

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Section: Doi: 101002/adom202200256mentioning

confidence: 99%

Nearly 100% Exciton Utilization via Hybridized Inter‐ and Intramolecular Triplet Exciton Harvesting Channels in Blue Fluorescent Organic Light‐Emitting Diodes

Lee

Patil

Lim

et al. 2022

Advanced Optical Materials

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“…[25][26][27][28][29] A lot of jobs in this field have been reported and they are well reviewed by Ma et al very recently. [24,[30][31][32][33][34][35][36][37][38][39][40][41][42][43] Blue "hot exciton" materials are mostly focused on molecules containing phenanthroimidazole (PI) or Anthracene (An) segment and other kind of molecules are also investigated occasionally. [44][45][46][47] PI was selected as the parent for "hot exciton" molecules because it is easily modified and their derivatives are usually thermally stable apart from the "hot exciton" characteristics.…”

Section: Introductionmentioning

confidence: 99%

Bipolar Molecules with Hybridized Local and Charge‐Transfer State for Highly Efficient Deep‐Blue Organic Light‐Emitting Diodes with EQE of 7.4% and CIE_y ∼ 0.05

Zheng

Zhu

et al. 2021

Advanced Optical Materials

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Donor−acceptor molecules with hybridized local and charge transfer (HLCT) excited state have been demonstrated to be an efficient strategy for achieving high performance electroluminescence by harvesting both singlet and triplet excitons. In this study, a series of bipolar D−A molecules with twisted bridge are synthesized and these chromophores exhibit good thermal, morphological and photophysical properties, electrochemical stabilities as well as HLCT excited state features. Excellent deep‐blue electroluminescence (EL) performances are achieved using CSiTPI (external quantum efficiency (EQE) of 7.1% and CIEx,y coordinates of (0.16, 0.06) in a nondoped OLED) and DSiTPI (EQE of 7.4% and CIEx,y of (0.16, 0.05) in a doped OLED) as emitters with small full width at half maxima (FWHM, 45−48 nm). Devices using DSiTPI and CSiTPI as hosts are also fabricated and all the devices show high EL performances and small efficiency roll‐offs. A green device with DSiTPI acquires maximum current, power, and EQE of 78.5 cd A−1, 72.5 lm W−1, and 20.8%. The research demonstrates that excellent deep‐blue EL performances with good color purity can be achieved using D−A emitters with highly twisted bridge in HLCT OLEDs.

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“…Consequently, all generated excitons are utilized, enhancing the device efficiency of fluorescent OLEDs. Moreover, as they are donor‐acceptor type structure, facilitating charge transport are profitably enhanced [7a,b,11] . Recently, HLCT‐based OLEDs have been much interested and reported.…”

Section: Introductionmentioning

confidence: 99%

Twisted Phenanthro[9,10‐d]imidazole Derivatives as Non‐doped Emitters for Efficient Electroluminescent Devices with Ultra‐Deep Blue Emission and High Exciton Utilization Efficiency

Kaiyasuan

Chasing

Nalaoh

et al. 2021

Chemistry An Asian Journal

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Herein, two deep‐blue emissive molecules (SAF‐PI and SAF‐DPI) are designed and synthesized using spiro[acridine‐9,9’‐fluorene] as a donor (D) substituted with 2‐(3‐methylphenyl)‐1‐phenyl‐phenanthro[9,10‐d]imidazole as an acceptor (A), forming twisted D−A and A−D−A structures, respectively. The photophysical studies and density functional theory (DFT) calculations reveal that both molecules exhibit hybridized local excited and charge transfer (HLCT) characteristics with deep blue emission color. They are effectively applied as non‐doped emitters in OLEDs. Particularly, SAF‐PI‐based device achieves the high‐definition television (HDTV) standard blue color emission peaked at 428 nm with CIE coordinate of (0.156, 0.053), a narrow full width at half maximum of 55 nm, a maximum external quantum efficiency (EQEmax) of 4.57% and an exciton utilization efficiency of 65%.

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Hybridized local and charge-transfer excited state fluorophores enabling organic light-emitting diodes with record high efficiencies close to 20%

Abstract: The pure organic emitters with full utilization of triplet excitons are in high demand for organic light-emitting diodes (OLEDs). Herein, through modulation of electron donors and introduction of phenyl rings...

Cited by 92 publications

References 26 publications

Nearly 100% Exciton Utilization via Hybridized Inter‐ and Intramolecular Triplet Exciton Harvesting Channels in Blue Fluorescent Organic Light‐Emitting Diodes

Nearly 100% Exciton Utilization via Hybridized Inter‐ and Intramolecular Triplet Exciton Harvesting Channels in Blue Fluorescent Organic Light‐Emitting Diodes

Bipolar Molecules with Hybridized Local and Charge‐Transfer State for Highly Efficient Deep‐Blue Organic Light‐Emitting Diodes with EQE of 7.4% and CIE_y ∼ 0.05

Twisted Phenanthro[9,10‐d]imidazole Derivatives as Non‐doped Emitters for Efficient Electroluminescent Devices with Ultra‐Deep Blue Emission and High Exciton Utilization Efficiency

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Hybridized local and charge-transfer excited state fluorophores enabling organic light-emitting diodes with record high efficiencies close to 20%

Abstract: The pure organic emitters with full utilization of triplet excitons are in high demand for organic light-emitting diodes (OLEDs). Herein, through modulation of electron donors and introduction of phenyl rings...

Cited by 92 publications

References 26 publications

Nearly 100% Exciton Utilization via Hybridized Inter‐ and Intramolecular Triplet Exciton Harvesting Channels in Blue Fluorescent Organic Light‐Emitting Diodes

Nearly 100% Exciton Utilization via Hybridized Inter‐ and Intramolecular Triplet Exciton Harvesting Channels in Blue Fluorescent Organic Light‐Emitting Diodes

Bipolar Molecules with Hybridized Local and Charge‐Transfer State for Highly Efficient Deep‐Blue Organic Light‐Emitting Diodes with EQE of 7.4% and CIEy ∼ 0.05

Twisted Phenanthro[9,10‐d]imidazole Derivatives as Non‐doped Emitters for Efficient Electroluminescent Devices with Ultra‐Deep Blue Emission and High Exciton Utilization Efficiency

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Bipolar Molecules with Hybridized Local and Charge‐Transfer State for Highly Efficient Deep‐Blue Organic Light‐Emitting Diodes with EQE of 7.4% and CIE_y ∼ 0.05