Isomer engineering of dipyrido[3,2-a:3′,4′-c]phenazine-acceptor-based red thermally activated delayed fluorescent emitters

Abstract

To determine the effect of donor substitution pattern on XX, we designed and synthesized two isomeric red thermally activated delayed fluorescent (TADF) emitters, i.e., 11,12-bis(9,9-dimethylacridin-10(9H)-yl)dipyrido[3,2-a:2',3'-c]phenazine (oDMAC-DPPZ) and 10,13-bis(9,9-dimethylacridin-10(9H)-yl)dipyrido[3,2-a:2',3'-c]phenazine (pDMAC-DPPZ). Two...

Rational design of orange-red iridium(iii) complexes by an isomer engineering strategy for improved performance of white organic light-emitting diodes

“…Their emission behavior and EL performance are well regulated by structural isomer modulation. 41–43 The photoluminescence quantum yield (PLQY) of Ir(pq) 2 pbi in solution is 0.98, which is much higher than that of Ir(piq) 2 pbi (0.47). The high emission efficiency results in their monochromic device exhibiting better EL performance in comparison with classical dyes in the same device structure.…”

Design strategies and applications of novel functionalized phenazine derivatives: a review

“…[3][4][5][6][7][8][9][10] Phenazine is a rigid planar, redox-active and electrondeficient aromatic compound, which could be easily modified with functional groups or combined with some ligands to create novel functional materials. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] In the design of photoelectric functional materials, it becomes one of the most attractive and appropriate structures. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] Typically, the functionalization of nitrogen atoms on the phenazine skeleton leads to the formation of a series of phenazine derivatives with variable absorption and fluorescence properties.…”

Efficient thermally activated delayed fluorescent emitter based on a spiro-type benzo[b]acridine donor and a benzophenone acceptor

“…The twisted structure gives the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) a large degree of separation, thus resulting in a small electron exchange energy. [18][19][20][21][22][23][24] Furthermore, spin flips between the two excited states are forbidden when both S 1 and T 1 are charge transfer (CT) states according to the El-Sayed rule. 25 In this case, an intermediate is needed to facilitate the conversion of triplet excitons from 3 CT to 1 CT.…”