Highly efficient green phosphorescent OLEDs based on a novel iridium complex

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

“…However, in the solid state Ir-PN1 gives a notably red-shifted emission peak (l em = 510 nm) with enhanced phosphorescence, which is attributed to the aggregationinduced phosphorescent emission (AIPE). 455 The -CF 3 substituted auxiliary ligand stabilizes the HOMO slightly more than the LUMO, leading to a slightly blue-shifted emission of Ir-PN3 (l em = 517 nm) as compared to that of Ir-PN2 (l em = 524 nm). However, in the solid state, the excimeric interactions between the cyclometalating ligands of adjacent complexes will shift the lowest excited state from 3 LX to the emissive triplet metal-metal-to-ligand charge transfer ( 3 MMLCT) excited state, resulting in the lower energy emission accompanied by the increased F P .…”

“…[454][455][456] Compared with its analogue bis[(4,6-difluorophenyl)pyridinato-N,C 20 ]iridium(acetylacetonate) [FIr(acac)], 424 Ir-PN1 (Fig. [454][455][456] Compared with its analogue bis[(4,6-difluorophenyl)pyridinato-N,C 20 ]iridium(acetylacetonate) [FIr(acac)], 424 Ir-PN1 (Fig.…”

Organometallic Versus Organic Molecules for Energy Conversion in Organic Light-Emitting Diodes and Solar Cells

“…The green OLEDs based on its heteroleptic counterpart Ir (ppy) 2 (acac) were also reported to show attractive performance with η ext of 23.7 % and η P of 105 lm/W [15]. By using Ir(tfmppy) 2 (tfmtpip) as the green phosphor, a maximum η P and η L of 113.23 lm/W and 115.39 cd/A, respectively, were achieved at a doping level of 5 wt% [16], in which the introduction of CF 3 moiety to the Ir(III) complex was believed to increase the electron mobility of the complex and thus enhance the overall efficiencies of the device. Ir(piq) 3 is a wellknown red phosphorescent emitter [17].…”

Novel Ir(ppy)3 Derivatives: Simple Structure Modification Toward Nearly 30% External Quantum Efficiency in Phosphorescent Organic Light‐Emitting Diodes

“…The maximum external quantum effi ciencies of around 30% for 4F and 5F devices are among the highest values ever reported for green phosphorescent OLEDs so far. [ 5,6,11,12,22 ] Adv …”

“…[10][11][12] Most recently, Forrest and co-workers invented a series of N-heterocyclic carbene (NHC) Ir(III) complexes that served as deep blue emitters with very high brightness and effi ciency, which may be one great breakthrough of deep blue phosphorescent materials and devices. [ 13 ] In comparison, the obvious progress in developing novel and excellent green emitting materials is almost absent in recent years.…”