Oxygen sensing and OLED applications of di-tert-butyl-dimethylacridinyl disubstituted oxygafluorene exhibiting long-lived deep-blue delayed fluorescence

Abstract

Optical sensors with high oxygen sensitivity and efficient deep-blue OLEDs with CIEy of 0.08 was developed using the simplicity in molecular design of di-tert-butyl-dimethylacridanyl disubstituted oxygafluorene.

Reversibly Switchable Phase‐Dependent Emission of Quinoline and Phenothiazine Derivatives towards Applications in Optical Sensing and Information Multicoding

“…A 10 wt % solid dispersion of PZPQ in Zeonex was prepared for testing the oxygen sensitivity of the compound. Zeonex was used as a rigid matrix to suppress intermolecular interactions [37–39] and leave the energy transfer to the oxygen molecules as the main path of nonradiative deactivation of excitons and exclude energy transfer between conformers. PL spectra were recorded consecutively under conditions of different nitrogen/oxygen ratios maintained for 15 min each for the stabilization of intensity.…”

“…While potential application of compoundsp PZPQ and mPZPQ in memory devices( data storage) with multicoding properties was demonstrated, PZPQ containing no phenylene linker and characterized by constantT ADFw as used as oxygen-sensing probe.A10 wt %s olid dispersion of PZPQ in Zeonex was prepared for testing the oxygen sensitivity of the compound. Zeonex wasu sed as ar igid matrix to suppress intermolecular interactions [37][38][39] and leave the energyt ransfer to the oxygen molecules as the main path of nonradiative deactivation of excitons and exclude energy transfer between conformers. PL spectra were recorded consecutively under conditions of different nitrogen/oxygen ratios maintained for 15 min each for the stabilization of intensity.A ss hown in Figure 9a,t he emission of PZPQ is strongly quenched by oxygen,w hichi ntercepts the triplete lectronic excitation energy.T he emissionb and related to the q-eq conformer is considerably more suppressed than that of q-ax conformer even at low fractions of oxygen, owing to itsm ore pronouncedT ADF character.M ore specifically,t he TADF intensity of the q-eq conformer of PZPQ derived from the measurement in an itrogen environment was found to be about 22.5 times higher than that of its prompt fluorescence under oxygen flow.A tt he same time, only at wofold increase was observed for the band relatedt ot he q-ax conformer due to suppression of the nonradiativee xciton deactivation.…”

Ornamenting of Blue Thermally Activated Delayed Fluorescence Emitters by Anchor Groups for the Minimization of Solid-State Solvation and Conformation Disorder Corollaries in Non-Doped and Doped Organic Light-Emitting Diodes

“…24 Featureless emission spectra with a single broad band of the conventional TADF emitters must is red-shifted and broadened with the increase in solvent polarity due to the CT character of the first singlet excited state. 40,41 No obvious shifts of absorption spectra, but considerable red shifts of the fluorescence spectra on going from non-polar hexane (dielectric constant ε = 1.88, Δf = 0.0001) to highly polar DMF (ε = 36.7, Δf = 0.2755) were observed. This observation indicates that the dipole moment changes were contributed by the excited states.…”

Dominant dimer emission provides colour stability for red thermally activated delayed fluorescence emitter

“…The dependence of the PLQY on the presence of oxygen and the inherent temperature dependence of the rISC process could be used to construct TADF-based oxygen and temperature sensors, as has been described in recent literature. [38][39][40][41] The relatively high singlet oxygen quantum yield, red-shifted emission and material stability make 4DTPIPN an interesting material for (image-guided) photodynamic therapy applications. 42 While many TADF emitters have relatively high triplet formation yields, they are seldomly applied as photosensitizers.…”