A versatile thermally activated delayed fluorescence emitter for both highly efficient doped and non-doped organic light emitting devices

Abstract

A thermally activated delayed fluorescent (TADF) emitter (DMAC-TRZ) was reported either as the emitting dopant in a host or as the non-doped (neat) emitting layer to achieve high EL EQEs of up to 26.5% and 20% in OLEDs, respectively.

Molecular Orbital Controlling Donor Moiety for High‐Efficiency Thermally Activated Delayed Fluorescent Emitters

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Overall performances of TADF emitters are generally determined by the typeofdonor and acceptor moieties comprising the molecules. [7,[10][11][12][13][14] The carbazole-type donors are moderate donor moieties, whilet he acridine-type donors are strong donor moieties. [2] Representative donor moieties widely reported in the literature are carbazole-type donor moieties [5][6][7][8][9][10] and acridine-type donor moieties.…”

“…Therefore, engineering the donor and acceptorm oieties of TADF emitters is one of key technologiesd ominating the device characteristics of TADF OLEDs.E ven thoughb oth donor and acceptor moieties play ad ecisive role foro ptimizing TADF properties of the TADF emitters, the donor moieties are more important than the acceptor moieties. The combination of acridine-diphenylsulfoner esulted in blue emission, [11] that of acridine-diphenyltriazine in green emission, [12] and acridine-anthracenedionei nr ed emission in addition to ah ighe fficiency. [7,[10][11][12][13][14] The carbazole-type donors are moderate donor moieties, whilet he acridine-type donors are strong donor moieties.…”

Recent progress of green thermally activated delayed fluorescent emitters

“…After the initial literatures about the triazine derivatives, great progress was achieved in the device performances by modifying the triazine acceptor with an acridine-type donor moiety. 10-(4-(4,6-Diphenyl-1,3,5-triazin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (DMAC-TRZ) is one of the best-performing triazine derivatives for the green TADF OLEDs [52,53]. The modification of the triazine moiety with the acridine donor effectively produced a green emitter with a small E ST of 0.05 eV, a short excited-state lifetime of 3.6 μs, and an accompanying high PLQY of 0.83 owing to the strong donor power of the acridine moiety.…”

Effects of an Ultra-thin Green Phosphor on White Organic Light-emitting Devices With Double Doped Emissive Layers

“…This problem can be solved by employing an ultra-thin non-doped layer of Ir(ppy)3 in two-color white OLEDs, so as to realize high device efficiency with simplified device structure. The OLEDs based on ultrathin EMLs has been demonstrated to achieve high device performance comparable to the ones based on doped EMLs [16][17][18][19].However, there is rare work on introducing an ultra-thin non-doped layer ofIr(ppy)3 into doped two-color white OLEDs.…”