Organic TADF materials design
This themed issue covers organic thermally activated materials design. The corresponding compounds can be used as components in organic light-emitting diodes (OLEDs), as photocatalysts, as imaging or sensing reagents, or as lasing materials. The focus herein is on the design, synthesis, properties, and use of thermally activated delayed fluorescence (TADF) compounds.
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- Published 25 Apr 2022
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Figure 1: Chemical structures of 1 and POZ-DBPHZ.
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Scheme 1: Synthesis of compound 1.
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Figure 2: Steady-state UV–vis absorption (Abs) and photoluminescence (PL) spectra of dilute solutions (c ≈ 10...
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Figure 3: Time-resolved PL decay profiles (intensity vs delay time) and spectra of 1 in a), b) Zeonex® and c,...
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Figure 4: The characteristics of the OLED devices: a) electroluminescence spectra; b) current density-bias ch...
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Figure 5: Schematics of the TADF mechanisms along with NTOs for the relevant electronic states for a) D–A com...
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- Published 05 May 2022
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Figure 1: 2-Modified 4,6-bis(3,6-di-tert-butyl-9H-carbazol-9-yl)-5-methylpyrimidines.
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Scheme 1: Synthesis of 4,6-bis(3,6-di-tert-butyl-9H-carbazol-9-yl)-5-methyl-2-substituted pyrimidines 1–6. Re...
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Figure 2: HOMO and LUMO spatial distributions of carbazole–pyrimidine TADF compounds.
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Figure 3: Absorption (grey lines), fluorescence (black lines) and 10K phosphorescence (red lines) spectra of ...
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Figure 4: Fluorescence decay transients of 1 wt % PMMA films of carbazole–pyrimidine TADF compounds in oxygen...
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- Published 12 Jul 2022
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Figure 1: Chemical structures of Lewis acid examples.
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Figure 2: Chemical structures of Lewis basic fluorescent polymer poly{2,5-pyridylene-co-1,4-[2,5-bis(2-ethylh...
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Figure 3: (a) Normalized PL spectra of films with compound 1 doped with different Lewis acids. (b) PL spectra...
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Figure 4: Schematic diagram of a BF3·OEt2 vapor-treated device and the macroscopic gradation emissive pattern...
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Figure 5: Chemical structures of Lewis basic fluorescent compounds 3–14.
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Figure 6: (a) PL spectra of compound 6 in toluene after addition of 0.0 (black line), 0.1 (red line), 0.3 (gr...
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Figure 7: Photos of a solution of compound 12 and B(C6F5)3 at different ratios in toluene under a 365 nm UV l...
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Figure 8: Structure of small molecule 15 containing pyridine and thiazole groups reported by Bazan et al. and...
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Figure 9: (a) 1H NMR spectra in the aromatic region and (b) 19F NMR spectra of compound 15 (top) and the mixt...
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Figure 10: Pyrazine-containing polymers 19 and 20 investigated by Li et al.
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Figure 11: (a) HOMO/LUMO orbitals and energy levels (unit: eV) and (b) electrostatic potential surface (EPS) m...
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Figure 12: (a) UV–vis absorbance and (b) PL spectra (excited by 330 nm) for 35DCzPPy (compound 14), B(C6F5)3, ...
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Figure 13: (a) Schematic diagram of the low-band gap materials 21 and 22. (b) Ground state geometry optimizati...
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- Published 08 Sep 2022
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Scheme 1: Synthetic schemes of BPy-pTC and BPy-p3C.
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Figure 1: (a) Normalized absorption spectra of BPy-pTC and BPy-p3C in toluene at room temperature; (b) normal...
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Figure 2: Transient photoluminescence decay (λex = 375 nm) of (a) BPy-pTC and (b) BPy-p3C in degassed THF (10...
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Figure 3: AIEE studies: Emission spectra (λex = 375 nm, 10 µM) of (a) BPy-pTC and (d) BPy-p3C in THF with inc...
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Figure 4: Normalized fluorescence at room temperature and phosphorescence spectra at 77 K (λex = 375 nm, 10 µ...
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Figure 5: Transient photoluminescence decay (λex = 375 nm, 20 µM) of (a) BPy-pTC and (b) BPy-p3C aggregates i...
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Figure 6: Fluorescence switching by acid and base fumes exposure: Emission spectra (λex = 375 nm) of (a) BPy-p...
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Figure 7: Fluorescence intensity vs number of exposures for (a) BPy-p3C and (b) BPy-pTC thin films upon expos...
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- Published 22 Sep 2022
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Figure 1: Chemical structures of (a) reported ionic TADF emitters for LEECs, (b) the MR-TADF emitter DiKTa an...
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Scheme 1: Synthesis of DiKTa-OBuIm and DiKTa-DPA-OBuIm.
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Figure 2: (a) HOMO and LUMO electron density distribution and orbital energies of DiKTa-OMe and DiKTa-DPA-OMe...
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Figure 3: (a) Cyclic and differential pulse voltammograms measured in degassed MeCN with 0.1 M [n-Bu4N]PF6 as...
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Figure 4: (a) Steady-state emission spectra of DiKTa-OBuIm and DiKTa-DPA-OBuIm in 1 wt % doped mCP films, λex...
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Figure 5: (a) Electroluminescence spectra of DiKTa-OBuIm (green curve), DiKTa-DPA-OBuIm (red curve) and 1% of ...
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