In this paper, we propose a potential method leading to high-energy emitting Cu(I) complexes. Diimine ligands with high-π* and their corresponding [Cu(N−N)(P−P)]BF4 complexes are synthesized. Systematic research proves that the utilization of diimine is practicable effective lead emission from Efficient blue- green-emitters realized, electroluminescence (EL) performances also investigated. A maximum brightness 2850 cd/m2 achieved for blue-emitting EL device, an peaking at 480 nm. Meanwhile,...

Abstract Several bipyridylrhenium( I ) surfactant complexes, fac ‐[Re(CO) 3 (bpy)(L)]PF 6 [bpy = 2,2′‐bipyridine, L trans ‐4‐dodecyloxy‐4′‐stilbazole ( L1 ), ‐4‐octadecyloxy‐4′‐stilbazole L2 4‐(4′‐dodecyloxyphenylethynyl)pyridine L3 )] were synthesized and characterised. The X‐ray crystal structure of (bpy)( )]PF has been determined. complexes exhibited intense photo‐luminescence which ascribed to the dπ(Re) ⇄ π*(bpy) metal‐to‐ligand charge transfer (MLCT) triplet emission. found form stable...

We have demonstrated two kinds of stacked white organic light-emitting diodes (WOLEDs) employing tri(8-hydroxyquinoline) aluminum:20 wt %Mg/MoO3 as charge generation layer. White light emission can be obtained by mixing blue fluorescence and orange phosphorescence. Stacked WOLED with individual fluorescent phosphorescent emissive units has better color stability higher efficiency than that double units, which is attributed to the avoidance movement charges recombination zone elimination...

White top-emitting organic light-emitting devices (TEOLEDs) with down-conversion phosphors are investigated from theory and experiment. The theoretical simulation was described by combining the microcavity model model. A TEOLED combination of a blue phosphor 3-(4-(diphenylamino)phenyl)-1-pheny1prop-2-en-1-one fabricated to validate simulated results. It is shown that this approach permits generation white light in TEOLEDs. efficiency twice over corresponding TEOLED. feasible methods improve...

In this paper, we report a novel organoeuropium complex [Eu(DPDBM)3DPPZ] based on triphenylamine-derived β-diketone ligand for short-lived emitter exploration. The 5D0 → 7F2 (∼610 nm) luminescence lifetime of Eu(DPDBM)3DPPZ is only 30 μs, which 1 order magnitude shorter than that typical Eu3+ complex. electroluminescence device using as the achieves maximum current efficiency 3.0 cd/A, and roll-off largely reduced because emitter's short lifetime.

Highly efficient nondoped phosphorescent organic light-emitting devices (NPOLEDs) with triplet multiple quantum well structures are fabricated by using 4,4′-N,N′-dicarbazole-biphenyl and an iridium(III) complex as the potential barrier layer layer/light-emitting layer, respectively. Remarkably, such NPOLED optimized device configuration achieves reduced current efficiency roll-off, which slightly decreases from its peak value of 31.5 cd/A at 19.8 mA/cm2 to 29.2 100 mA/cm2. We attribute this...

A complex (3-ethyl-2-(4′-triphenylamino)imidazo[4,5-f] 1,10-phenanthroline) Re(CO)3Br functionalized by a hole-transport group triphenylamine was used to fabricate organic light-emitting devices (OLEDs). current efficiency up 17.6cd∕A corresponding power of 9.2ml∕W and peak brightness as high 6500cd∕m2 were obtained. These results represent the best values reported for OLEDs based on rhenium complexes. Enhanced carrier injection capability Re efficient charge-trapping formation followed...

Low-voltage and high-efficiency nondoped phosphorescent organic light-emitting devices are fabricated by introducing a simple triplet double-quantum-well structure with an Ir(III) complex as potential well layer (PWL) emitting (EML). The effects of various barrier (PBL) on device performances discussed. Remarkably, the 1,3,5-tris(N-phenyl-benzimidazol-2-yl)benzene (TPBi) PBL shows low turn-on voltage 2.30 V, maximum power efficiency 30.5 lm/W at 2.65 V 24.5 1000 cd/m2 3.75 V. We attribute...

Red organic light-emitting diodes using a rhenium(I) bipyridyl complex, fac-[ClRe(CO)3(trans-4-methyl-4′-(2-4-octadecyloxylphenyl)vinyl)-2,2′-bipyridine] (Re-mopvb), as an emitter were fabricated. The optimized device has bilayer structure of indium-tin oxide∕poly(N-vinylcarbazole): 2 wt. % Re-mopvb (80 nm)∕2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (50 nm)∕LiF (1 nm)∕Al (150 nm). Although no photoluminescence from in the room-temperature solution appeared due to photoinduced...

Efficient white organic light-emitting diodes based on copper complex, [Cu(bis[2-(diphenylphosphino)phenyl]ether)(6,7-dicyanodipyrido[2,2-d:2′,3′-f]quinoxaline)]BF4 [Cu(I) complex], in which the emission composed of yellow from Cu(I) complex doped 4,4′-N,N′-dicarbazole-biphenyl (CBP) layer and blue N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′-benzidine)-4,4′-diamine layer, were fabricated. A thin 2-(4-biphenylyl)-5-(4-tert-butyl-phenyl)-1,3,4-oxadiazole (Bu-PBD) sandwiched between two layers...

Top-emitting white organic light-emitting devices (TEWOLEDs) with 1D metallic-dielectric photonic crystal (1D MDPC) as an anode are investigated. A quasi-periodic MDPC allowed for fabrication of multiple-peak TEWOLEDs. two-peak or three-peak TEWOLED was obtained by simply adjusting the thickness dielectric layers in MDPC. The efficiency TEWOLEDs comparable to corresponding bottom WOLED (11.1 cd/A), which 9.9 (two-peak device) and 9.4 cd/A (three-peak device), respectively, contrast is about...

Stacked white organic light-emitting devices (WOLEDs) comprising of blue fluorescent and orange phosphorescent emissive units employing tri(8-hydroxyquinoline) aluminum (Alq3):Mg/MoO3 as charge generation layer are fabricated. The working mechanism Alq3:Mg/MoO3 is also discussed using a simple method. We demonstrate charge-carrier separation takes place only in MoO3 layer. WOLED with better performance was obtained by adjusting the thickness MoO3. stacked efficiency 39.2 cd/A has excellent...

In this paper, we report two easily synthesized pure blue-emitting phosphorescent Cu(I)-based emitters. The nature of the blue emissions ( and 450 nm) has been identified by both theoretical calculations experimental data. are closest to light among Cu(I) complexes, their photoluminescence characters comparable with those reported noble metal complexes. An electroluminescent device using one emitters is fabricated, a maximum brightness achieved.

Highly efficient orange-yellow organic electroluminescent (EL) devices based on Re(CO)3Cl-dipyrido[3,2-a:2′,3′-c]phenazine (Re-DPPz) have been fabricated. By incorporating Re-DPPz into EL with balanced charge injection and host-to-guest energy transfer, the performances were significantly improved comparing previously reports same complex. For device 7wt% doped emissive layer, turn-on voltage of 6V, maximum efficiency 6.3cd∕A, emission brightness approaching 1000 cd∕m2 achieved. The...

The extraction and complexation of trivalent americium (Am) lanthanides (Ln) using an asymmetric picolinic acid-derived tridentate N,O-hybrid ligand, 6-(dioctylcarbamoyl)picolinic acid (DOAPA), have been studied through both experimental theoretical methods. DOAPA exhibits effective fast Am(III) Ln(III). is driven by favorable enthalpy change. Slope analysis, absorption spectroscopy NMR titration indicate that Ln(III) coordinate with to form complexes a 1 : 3 stoichiometry (metal ligand)....

Highly efficient orange organic electroluminescent devices based on Re(CO)3Cl-bathophenanthroline have been fabricated. A device with 9 wt% shows the highest efficiencies of 13.8 cd A−1 (luminance efficiency), 8.69 lm W−1 (power efficiency) and 5.24% (external quantum efficiency). Maximum luminance over 4000 m−2 is obtained. By discussing mechanisms, it believed that trapping contributes mostly to these relatively much higher efficiencies.