Efficient yellow and red thermally activated delayed fluorescence materials based on a quinoxaline-derived electron-acceptor

Abstract

Thermally activated delayed fluorescence (TADF) molecules, which can realize 100% internal quantum efficiency without using noble metals, have emerged as the third-generation organic light emitting-diode (OLED) emitters. However, high-efficiency red...

Theoretical and experimental insights into the properties of donor–σ–acceptor type derivatives of quinoxaline and methanone containing different donor moieties

“…aScaled using correlation equation from our previous paper 4 values of λ ABS and λ PL are given: λ ABS (scaled) = 1.027· λ ABS (calc.) + 61.60; λ PL (scaled) = 0.738· λ PL (calc.)…”

“…Quinoxaline is a nitrogen-containing heterocyclic aromatic compound formed by the fusion of benzene and pyrazine rings. 1–3 Such an N-type heterostructure has electron-withdrawing properties that can be efficiently used in the design of the structures of organic electroactive compounds for organic light emitting diodes (OLED), 4–6 pH sensors, 7–9 dye-sensitized solar cells (DSSC), 10–12 and luminescent solar concentrators. 13,14 The electron-deficient quinoxaline unit can be easily modified for the design of the structures of highly efficient functional materials for organic electronics.…”

Voltage-Dependent Emission Varying from Blue to Orange–Red from a Nondoped Organic Light-Emitting Diode with a Single Emitter

“…The photophysical parameters were quantified, and the results are collected in Table 1 to provide further insights. The parameters were calculated based on the previous report [ 20 ]. According to the results, the PLQY of the doped film surpassed that of the neat film by a small margin.…”

Synthesis, optical and electrochemical properties of (D–π)2-type and (D–π)2Ph-type fluorescent dyes

“…The design and development of a new type of organic fluorescent dyes have been of considerable scientific and practical concern with the objective of not only fundamental studies [1][2][3][4][5][6][7][8][9][10][11][12][13] in synthetic chemistry, electrochemistry and photochemistry, but also their potential applications to emitters for optoelectronic devices, such as organic light-emitting diodes (OLEDs) [14][15][16][17][18][19][20][21][22], as well as fluorescent probes [23][24][25][26][27][28] for bioimaging and fluorescent sensors for specific target species [29][30][31][32]. Among many kinds of organic fluorescent dyes, much efforts have been made on the development of donor-π-acceptor (D-π-A)-type fluorescent dyes constructed of an electron-donating moiety (D) and an electron-withdrawing moiety (A), linked by a π-conjugated unit thanks to their intense photoabsorption and fluorescence emission characteristics originating from the intramolecular charge transfer (ICT) excitation from the D to the A moiety [4][5][6][7][8][9][18][19][20]25,…”

“…Among many kinds of organic fluorescent dyes, much efforts have been made on the development of donor-π-acceptor (D-π-A)-type fluorescent dyes constructed of an electron-donating moiety (D) and an electron-withdrawing moiety (A), linked by a π-conjugated unit thanks to their intense photoabsorption and fluorescence emission characteristics originating from the intramolecular charge transfer (ICT) excitation from the D to the A moiety [4][5][6][7][8][9][18][19][20]25,26]. Furthermore, the (D-π-) 2 A-type fluorescent dyes with two D-π moieties have recently been stimulating intensive research efforts because of their high molar extinction coefficients and fluorescence quantum yields, compared to those of D-π-A-type fluorescent dyes [10][11][12][13]21,22,27,28,32].…”