level. Carbazole-containing polymers were used as organic light-emitting diodes, [1][2][3] photovoltaic cells, [4,5] and thin-film transistors. [6,7] They have also found application in electrochromic devices as they can form relatively stable cations on the application of voltage. [8,9] Carbazole-based compounds also found application in the synthesis of several thermally activated delayed fluorescence (TADF) materials, which are capable of enhancing the emission efficiency of present-day organic light-emitting diodes (OLEDs) by harvesting the excitons in a triplet state. [10,11] However, the realization of such beneficial materials requires the proper combination of carbazoles with suitable acceptor units with a twisted structure with a reduced energy gap between the singlet and triplet states. Carbazoles are also utilized as donor units in donor-acceptor (D-A) compounds with a high potential for synthetic tunability, ambipolar charge transport, and light-emitting materials with high emission efficiency. [12][13][14][15] A wide variety of carbazole derivatives are used in fluorescent and phosphorescent OLEDs due to their suitable energy levels, good charge transport behavior, and high triplet energies as host materials. [16][17][18][19][20][21] Being an inexpensive, stable starting material with the ease of functionalization by N-alkylation and core modification, carbazole provides enormous opportunities for structural modifications to realize functional materials. [22] Quinoxaline derivatives also have been used in organic electronic devices like organic solar cells, [23,24] OLEDs, [25] and organic field effect transistors (OFETs). [26] They have also found application in the construction of supramolecular self-assembling materials, [27] sensors, [28] and also as acceptor units in the building of D-A systems with low energy gaps. [29] Pei and co-workers developed tetrasubstituted pyrazino[2,3g]quinoxaline derivatives with thiophene and phenyl rings, which leads to varying extent of conjugation to achieve highefficiency active waveguide fibers. [30] Grimsdale and co-workers further extended the conjugation and introduced substituents at the quinoidal positions to study the electronic properties of the pyrazino[2,3-g]quinoxaline derivatives. [31] A water-soluble pyrazino [2,3-g]quinoxaline based photosensitizer reported by A new pyrazino[2,3-g]quinoxaline carbazole derivative with branched alkyl peripheral chains PQC-12b with a donor-acceptor-donor nonplanar architecture is reported. PQC-12b exhibits high molar extinction coefficients, low bandgap, bright emission behavior in solution and solid-state, along with positive solvatochromism. PQC-12b is used in organic light-emitting diodes (OLEDs) either as sole emissive material or as a guest in different host materials. Amongst these different host-guest OLEDs, CBP-based device with the optimized concentration of PQC-12b shows maximum values for power efficacy (PE max ) of 14.1 lm W −1 , current efficacy of 26.8 cd A −1 , external quantum efficiency (EQE max ) of ...
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