Circularly polarized thermally activated delayed fluorescence OLEDs with nearly BT.2020 red emission

Sun, Bangjin; Ding, Lei; Wang, Xinzhong; Tu, Zhen-Long; Fan, Jian

doi:10.1016/j.cej.2023.146511

Cited by 6 publications

(1 citation statement)

References 65 publications

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“…1–4 In addition, OLED displays can exhibit an impressively high resolution and large color gamut. 5–9 Therefore, modulation of the emission colors of OLEDs is of great importance, but to date it has generally been limited to two ways. The most common way is to use different emitters with diverse molecular structures, which can emit different colors of light; thus, a lot of chemical structure design and synthesis work need to be done.…”

Section: Introductionmentioning

confidence: 99%

The third strategy: modulating emission colors of organic light-emitting diodes with UV light during the device fabrication process

Sun,

Xu,

Hang

et al. 2024

Chem. Sci.

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Section: Introductionmentioning

confidence: 99%

The third strategy: modulating emission colors of organic light-emitting diodes with UV light during the device fabrication process

Sun,

Xu,

Hang

et al. 2024

Chem. Sci.

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Planar Chiral Thermally Activated Delayed Fluorescence Materials Based on Di[2.2]paracyclophane for Circularly Polarized Electroluminescence

Gong,

Yuan,

Zheng

et al. 2024

Adv Funct Materials

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In this study, featuring di[2.2]paracyclophane (DpCp) amine derivatives as electron donors and 4‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl)phenyl (Trz) as the electron acceptor, four thermally activated delayed fluorescence (TADF) molecules are disclosed. The C2 symmetric molecules, DpCpN‐Trz and DpCpCz‐Trz, bearing a chair‐like planar chiral di[2.2]paracyclophane moiety, are obtained as optically pure enantiomers (R/S)‐C‐DpCpN‐Trz and (R/S)‐C‐DpCpCz‐Trz. And the compounds B‐DpCpN‐Trz and B‐DpCpCz‐Trz with a bridge‐like di[2.2]paracyclophane skeleton are meso‐compounds, thus without optically activity. All emitters show blue emissions peaking from 464 to 485 nm, accompanied by high photoluminescence quantum efficiency (up to 93%). The enantiomers (R/S)‐C‐DpCpN‐Trz and (R/S)‐C‐DpCpCz‐Trz exhibit symmetric circularly polarized photoluminescence spectra with dissymmetry factors (|gPL|) ranging from 3.8 × 10−4 to 6.7 × 10−4 in toluene and films. The organic light‐emitting diodes (OLEDs) fabricated with these emitters achieve maximum external quantum efficiencies of up to 19.5%. Notably, the circularly polarized OLEDs (CP‐OLEDs) with (R/S)‐C‐DpCpN‐Trz and (R/S)‐C‐DpCpCz‐Trz demonstrate |gEL| factors of up to 7.6 × 10−4. This study demonstrates a feasible way to design TADF materials and enantiomers by incorporating DpCp derivatives for CP‐OLEDs.

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Chiral Sulfonyl Binaphthalene‐Based Thermally Activated Delayed Fluorescence Materials for Circularly Polarized Electroluminescence

Tong,

Wang,

Liao

et al. 2024

Advanced Optical Materials

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Chiral emitters capable of producing circularly polarized luminescence (CPL) with high dissymmetry factors (g) are crucial for circularly polarized organic light‐emitting diodes (CP‐OLEDs) and 3D display. Herein, sulfonyl binaphthalene is incorporated as both electron acceptor and chiral source into three pairs of thermally activated delayed fluorescence (TADF) enantiomers, (R/S)‐BPSTCZ, (R/S)‐BPSDMAC, and (R/S)‐BPSPXZ, for the first time, combining tert‐butylcarbazole, 9,9‐dimethyl‐9,10‐dihydro‐acridine and phenoxazine electron donors, respectively. These TADF compounds exhibit tunable emissions spanning from deep blue to green, accompanied by high photoluminescence quantum yields. Due to the large distorted angles caused by two sulfonyl units, all enantiomers exhibit pronounced CPL with |gPL| factors of up to 6.0 × 10−3 in doped films. The corresponding CP‐OLEDs display good performances with external quantum efficiencies of up to 28.5% and notable |gEL| factors of up to 8.8 × 10−3, surpassing most CP‐OLEDs based on chiral TADF materials.

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Circularly polarized thermally activated delayed fluorescence OLEDs with nearly BT.2020 red emission

Cited by 6 publications

References 65 publications

The third strategy: modulating emission colors of organic light-emitting diodes with UV light during the device fabrication process

The third strategy: modulating emission colors of organic light-emitting diodes with UV light during the device fabrication process

Planar Chiral Thermally Activated Delayed Fluorescence Materials Based on Di[2.2]paracyclophane for Circularly Polarized Electroluminescence

Chiral Sulfonyl Binaphthalene‐Based Thermally Activated Delayed Fluorescence Materials for Circularly Polarized Electroluminescence

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