Chiral Multi‐Resonance TADF Emitters Exhibiting Narrowband Circularly Polarized Electroluminescence with an EQE of 37.2 %

Yang, Yiyu; Li, Nengquan; Miao, Jingsheng; Cao, Xiaosong; Ao, Ying; Pan, Ke; Lv, Xialei; Ni, Fan; Huang, Zhongyan; Gong, Shaolong; Yang, Chuluo

doi:10.1002/anie.202202227

Cited by 70 publications

(46 citation statements)

References 56 publications

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“…Circularly polarized luminescence (CPL) can be induced using MR-TADF systems. [73,74] In 2021, Wang's group reported two pairs of CPL-active MR-TADF enantiomers, (R/S)-OBN-2CN-BN and (R/S)-OBN-4CN-BN [73] (Figure 4), grafted by axially chiral octahydro-binaphthol ((R/S)-OBN) units. (R/S)-OBN-2CN-BN and (R/S)-OBN-4CN-BN exhibited efficient narrowband green PL (λ PL = 493/500 nm, FWHM PL = 22/27 nm, and Φ PL = 99%/96% in toluene).…”

Section: Single-boron B/n Systemsmentioning

confidence: 99%

Narrowband Emissive Thermally Activated Delayed Fluorescence Materials

Kim

Yasuda

2022

Advanced Optical Materials

171

120

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Organic thermally activated delayed fluorescence (TADF) materials have attracted significant research interest in the field of organic electronics because of their inherent advantage of 100% exciton utilization capability in organic light‐emitting diodes (OLEDs) without the use of noble metals. However, despite their high internal electroluminescence quantum efficiencies approaching unity, broad emission spectra with sizable full width at half maxima (FWHM; 60–100 nm) present a critical issue that must be solved for their application in ultrahigh‐definition OLED displays. Recently, a new paradigm of TADF materials featuring the multiple resonance (MR) effect based on heteroatom‐doped polycyclic aromatic frameworks, referred to as MR‐TADF materials, has emerged and garnered considerable research interest owing to their remarkable features of efficient narrowband emissions with extremely small FWHMs (≤30 nm). Currently, MR‐TADF materials occupy a prominent position in the cutting‐edge research on organic light‐emitting materials from both chemical and physical perspectives. This review article focuses on recent progress in narrowband emissive MR‐TADF systems from the perspective of molecular design, photophysical properties, and electroluminescence performance in OLEDs. The current status and future prospects of this advanced material technology are discussed comprehensively.

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Section: Single-boron B/n Systemsmentioning

confidence: 99%

Narrowband Emissive Thermally Activated Delayed Fluorescence Materials

Kim

Yasuda

2022

Advanced Optical Materials

171

120

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“…Later, to obtain a small FWHM in CPL active MR‐TADF compounds, same group developed two new chiral emitters, namely, (R)‐ BN‐MeIAc and (S)‐BN‐MeIAc . [ 124 ] These emitters manifested not only small FWHM (30 nm), but the low Δ E ST 0.11 eV. Furthermore, these materials exhibited good morphological stability with decomposition temperature of 430 °C.…”

Section: Green Mr‐tadf Emittersmentioning

confidence: 99%

Boron‐Based Narrowband Multiresonance Delayed Fluorescent Emitters for Organic Light‐Emitting Diodes

Konidena

Naveen

2022

Advanced Photonics Research

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Recently, the exploration of boron (B)/heteroatom-embedded polycyclic nanographites featuring multiresonance thermally activated delayed fluorescence (MR-TADF) garners astonishing attention to promote the advancement of organic light-emitting diodes (OLEDs). Contrary to the traditional donor-acceptor (D-A)-type TADF emitters, the MR-TADF emitters manifest narrowband emission with full width at half maximum (FWHM ≤ 40 nm) and superior photoluminescence quantum yield (PLQY) coupled with the small singlet-triplet energy splitting, which appeal their potential as promising candidates in fabricating efficient OLEDs. Growingly, MR-TADF emitters deliver benchmark device performance comparable to the conventional TADF/phosphorescent emitters. However, they are suffering from the major drawbacks such as difficult to realize full-color emitters, slow exciton upconversion dynamics, aggregationcaused emission quenching, severe efficiency roll-off, and poor operational lifetime, which jeopardizes their practical applicability. Herein, a comprehensive review on B-based MR-TADF emitters reported till date is presented, focusing on the different design strategies documented for circumventing the aforementioned shortcomings. This review is divided into several subgroups based on the emission color of the materials to draw the attention of organic electronics community toward constructing efficient full-color MR-OLEDs. Finally, challenges and opportunities in the MR-TADF emitters are discussed.

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“…The CP-OLEDs based on R / S - TRZ-MeIAc and R / S - NID-MeIAc emitted efficient sky-blue and orange CPEL with EQE max of 20.3% and 23.7%, and g EL of +6.4/−7.4 × 10 −4 and +2.0/−2.4 × 10 −3 , respectively. Lately, by using MeIAc , they reported a pair of chiral MR-TADF molecules R / S - BN-MeIAc 37 (Fig. 8).…”

Section: Chiral Tadf Molecules Based On An Intrinsic Chirality Strategymentioning

confidence: 99%

Advances in circularly polarized electroluminescence based on chiral TADF-active materials

Chen

2022

Org. Chem. Front.

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Chiral Multi‐Resonance TADF Emitters Exhibiting Narrowband Circularly Polarized Electroluminescence with an EQE of 37.2 %

Abstract: Scheme 1. Molecular design strategy for narrowband emission circularly polarized thermally activated delayed fluorescence (CP-TADF) emitters.

Cited by 70 publications

References 56 publications

Narrowband Emissive Thermally Activated Delayed Fluorescence Materials

Narrowband Emissive Thermally Activated Delayed Fluorescence Materials

Boron‐Based Narrowband Multiresonance Delayed Fluorescent Emitters for Organic Light‐Emitting Diodes

Advances in circularly polarized electroluminescence based on chiral TADF-active materials

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