Equilibrating the key parameters of thermally activated delayed fluorescence emitters towards efficient red/near-infrared OLEDs

Fan, Jinming; Xu, Yulin; Li, Nengquan; Miao, Jingsheng; Zhou, Changjiang; Liu, Tengxiao; Zhu, Minrong; Yin, Xiaojun

doi:10.1039/d2tc03933h

Cited by 10 publications

(1 citation statement)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, Yin et al altered peripheral phenyl to benzofuryl or introduced naphthyl on the TPA group to construct red and NIR TADF emitters. 39 However, the device EQEs of dpnTPAAP decreased significantly from 18.9% at 630 nm to 12.6% at 680 nm when the doping ratio increased from 3 wt% to 20 wt%. Additionally, it is notable that the two compounds containing the functionalized TPA derivatives showed an obvious decline in oscillator strengths ( f ) relative to the prototype with the original TPA unit.…”

Section: Introductionmentioning

confidence: 97%

A dual-locked triarylamine donor enables high-performance deep-red/NIR thermally activated delayed fluorescence organic light-emitting diodes

et al. 2023

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 97%

A dual-locked triarylamine donor enables high-performance deep-red/NIR thermally activated delayed fluorescence organic light-emitting diodes

et al. 2023

View full text Add to dashboard Cite

show abstract

Synergistic Modulation of Excited State Ingredients and Chiroptical Activity for High‐Performance Pure‐Green Circularly Polarized Electroluminescence

Huang,

Li,

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

The integration of chiral elements within a multiple resonance (MR) motif affords a prospective avenue to construct satisfying emitters tailored for state‐of‐the‐art circularly polarized organic light–emitting diodes (CP‐OLEDs). However, the concurrently realizing of both high luminescence efficiency and favorable dissymmetry factors (gPL) still remains a formidable challenge, particularly when aligning with the requirement of high color purity. Herein, a dual‐pronged approach is proposed to reconcile such trade‐offs by directly fusing a secondary chiral donor onto the MR scaffold, thereby facilitating a hybrid short/long‐range charge‐transfer with fine‐tuned compositions. Theoretical calculations unveil the pronounced impact of the chiral donor on meticulously refining the characteristics of excited states, therefore yielding a considerable gPL of 3.3 × 10−3, along with a high fluorescence quantum yield of 0.97, and a rapid reverse intersystem crossing rate of 3.06 × 105 s−1 in one embodiment. Leveraging these merits, electroluminescence devices incorporating them as chiral dopants exhibit exceptional performance, showcasing a peak external quantum efficiency of 36.6% and remarkable Commission Internationale de L'Eclairage coordinates of (0.19, 0.71), which represent one of the most notable achievements among pure‐green CP‐OLEDs.

show abstract

Pure Polycyclic Aromatic Hydrocarbon Isomerides with Delayed Fluorescence and Anti‐Kasha Emission: High‐Efficiency Non‐Doped Fluorescence OLEDs

Huang,

Li,

et al. 2023

Advanced Science

Self Cite

View full text Add to dashboard Cite

Pure polycyclic aromatic hydrocarbons (PAHs) consisting solely of carbon‐hydrogen or carbon‐carbon bonds offer great potential for constructing durable and cost‐effective emitters in organic electroluminescence devices. However, achieving versatile fluorescence characteristics in pure PAHs remains a considerable challenge, particularly without the inclusion of heteroatoms. Herein, an efficient approach is presented that involves incorporating non‐six‐membered rings into classical pyrene isomerides, enabling simultaneous achievement of full‐color emission, delayed fluorescence, and anti‐Kasha emission. Theoretical calculations reveal that the intensity and distribution of aromaticity/anti‐aromaticity in both ground and excited states play a crucial role in determining the excited levels and fluorescence yields. Transient fluorescence measurements confirm the existence of thermally activated delayed fluorescence in pure PAHs. By utilizing these PAHs as emitting layers, electroluminescent spectra covering the entire visible region along with a maximum external quantum efficiency of 9.1% can be achieved, leading to the most exceptional results among non‐doped pure hydrocarbon‐based devices.

show abstract

Equilibrating the key parameters of thermally activated delayed fluorescence emitters towards efficient red/near-infrared OLEDs

Abstract: Equilibrating the critical parameters that associated with the thermally activated delayed fluorescence process propose the prerequisite for realizing high performance electroluminescence devices. Herein, precious manipulations relying on the model near-infrared...

Cited by 10 publications

References 53 publications

A dual-locked triarylamine donor enables high-performance deep-red/NIR thermally activated delayed fluorescence organic light-emitting diodes

A dual-locked triarylamine donor enables high-performance deep-red/NIR thermally activated delayed fluorescence organic light-emitting diodes

Synergistic Modulation of Excited State Ingredients and Chiroptical Activity for High‐Performance Pure‐Green Circularly Polarized Electroluminescence

Pure Polycyclic Aromatic Hydrocarbon Isomerides with Delayed Fluorescence and Anti‐Kasha Emission: High‐Efficiency Non‐Doped Fluorescence OLEDs

Contact Info

Product

Resources

About