Stable Electrophosphorescent Emission of Fluorenyltrifluoromethyl-Pyridine Iridium 2-Picolinic Acid at High Concentration

2013 ◽  
Vol 395-396 ◽  
pp. 96-99
Author(s):  
Wen Guan Zhang ◽  
Xiao Lan Shao ◽  
Xue Zhen Xie ◽  
Sheng Min Zhao
Keyword(s):  
Picolinic Acid ◽  
Iridium Complex ◽  
Maximum Luminance ◽  
High Concentration ◽  
Absorption Bands ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Ligand Charge Transfer ◽  
Excellent Stability

Emission spectrum of bis [2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethylpyridinto-C3, iridium (2-picolinic acid) (fl-5CF3-py)2Ir (pic) in THF was 572 nm. Two weak UV absorption bands can be assigned to spin-allowed singlet metal-to-ligand charge transfer (1MLCT) and spin-forbidden 3MLCT transitions. The organic light-emitting devices A ITO/PEDOT: PSS/PBD: PVK: (fl-5CF3- py)2Ir (pic) (12 %) /LiF/Al, B ITO/PEDOT:PSS/PBD: PVK: (fl-5CF3-py)2Ir (pic) (2 %) /TPBi/LiF/Al and C ITO/PEDOT:PSS/PBD: PVK: (fl-5CF3-py)2Ir (pic) (12 %) /TPBi/LiF/Al were fabricated using iridium complex as emitter dopant with electroluminescent spectra at 576, 572 and 576 nm, respectively. Devices A, B and C exhibited maximum luminance of 983 cd/m2 (at 10 V), 3132 cd/m2 (18 V) and 9876 cd/m2 (12V), respectively. Device C exhibited more efficient emission. The devices had excellent stability even at the high concentration.

Orange Electrophosphorescence of 2-(9, 9-Diethylfluoren-2-yl)-5- Trifluoromethylpyridine Iridium Complex

2013 ◽  
Vol 785-786 ◽  
pp. 624-627
Author(s):  
Wen Guan Zhang ◽  
Hui Pang ◽  
Sheng Min Zhao
Keyword(s):  
Charge Transfer ◽  
Emission Spectrum ◽  
Uv Absorption ◽  
Iridium Complex ◽  
Absorption Bands ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Ligand Charge Transfer ◽  
Luminescent Spectra

Emission spectrum of Iridium complex bis [2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl-pyridinto-C3, iridium (acetylacetonate) (fl-5CF3-py)2Ir (acac) in THF was 589 nm. Two weak UV absorption bands can be assigned to spin-allowed singlet metal-to-ligand charge transfer (1MLCT) and spin-forbidden 3MLCT transitions. The organic light-emitting devices A ITO/PEDOT: PSS/PBD: PVK: (fl-5CF3-py)2Ir (acac) (8 %) /LiF/Al and B ITO/PEDOT:PSS/PBD: PVK: (fl-5CF3-py)2Ir (acac) (8 %) /TPBi/LiF/Al were fabricated using iridium complex as emitter dopant with electro-luminescent spectra at 592 and 588 nm at the bias voltages of 9, 11 and 13V. Devices A and B exhibited luminance of 5265 (at 15 V) and 4098 cd/m2 with Commission International de LEclairage (CIE) coordinates of (0.5805, 0.4185) and (0.5815, 0.4176), respectively. Device B (with TPBi) emitted orange light more efficiently than Device A (without TPBi).

Synthesis, Characterization and Optical Properties Based on a Novel Re(I) Emitter with Bulky Building Block

2011 ◽  
Vol 295-297 ◽  
pp. 373-377 ◽  
Author(s):  
Tie Nan Zang ◽  
Xiao Li ◽  
Lian Shui Yu ◽  
Ji Ping Ru ◽  
Hai Jun Chi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photophysical Properties ◽  
Decomposition Temperature ◽  
Organic Light Emitting Diodes ◽  
Absorption Bands ◽  
Light Emitting ◽  
H Nmr ◽  
Rhenium Complex ◽  
Organic Light ◽  
Ligand Charge Transfer

A novel rhenium complex material, i.e., Re-APPP, (APPP, 2,3-acenaphtho[1,2-b]pyrazino [2,3-f][1,10]phenanthroline) was designed, synthesized in five steps from commercially available starting materials and characterized by FTIR,1H NMR and mass spectroscopy. The photophysical properties of this complex were studied. The absorption bands centered at ca. 326, 366 and 450nm of Re-APPP were attributed to the ligand-centered p→p* transition and the metal-to-ligand charge transfer dπ(Re)→π*(APPP) transition, respectively. Re-APPP was thermally stable with high decomposition temperature of 302°C. The organic light-emitting diodes using Re-APPP as a dopant emitter with the structures of ITO/m-MTDATA(10nm)/NPB(20nm)/CBP: Re-APPP(30nm)/BCP(10nm)/Alq3(30nm)/LiF(1nm)/Al(100nm) were fabricated and a broad electroluminescent peak at 550nm was observed. More importantly, the devices exhibited very small efficiency roll-off of only ca.45% which was probably attributed to its short luminescent lifetime.

High Brightness White Organic Light Emitting Devices Employing Phosphorescent Iridium Complex as RGB Dopants

2007 ◽  
Vol 364-366 ◽  
pp. 1072-1076
Author(s):  
Rui Li Song ◽  
Yu Duan
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diode ◽  
Iridium Complex ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Color Mixing ◽  
Coordinate Changes ◽  
Cie Chromaticity

An efficient phosphorescent white organic light-emitting diode (WOLED) was realized by using a bright blue-emitting layer, iridium (III) bis [(4, 6-di-fluoropheny)-pyridinato-N, C2’] picolinate doped 4.4’-bis (9-carbazolyl)-2, 2’-dimethyl-biphenyl, together with tris (2- Phenylpyridine) iridium and bis (1-phenyl-isoquinoline) acetylacetonate iridium (III) were codoped into 4,4’-N,N’-dicarbazole-biphenyl layer to provide blue, green, and red emission for color mixing. The device emission color was controlled by varying dopant concentrations and the thickness of blue and green-red layers as well as tuning the thickness of exciton-blocking layer. The maximum luminance and power efficiency of the WOLED were 37100cd/m2 at 17 V and 7.37lm/W at 5V, respectively. The Commission Internationale de 1’Eclairage (CIE) chromaticity coordinate changes from (0.41, 0.42) to (0.37, 0.39) when the luminance rangeed from 1000cd/m2 to 30000cd/m2.

Highly Efficient Multifunctional Phosphorescent Dendrimers Consisting of an Iridium-Complex Core and Charge-Transporting Dendrons for Organic Light-Emitting Devices

2005 ◽  
Vol 871 ◽  
Author(s):  
Toshimitsu Tsuzuki ◽  
Nobuhiko Shirasawa ◽  
Toshiyasu Suzuki ◽  
Shizuo Tokito
Keyword(s):  
First Generation ◽  
Green Emission ◽  
Iridium Complex ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Complex Core ◽  
Bright Green ◽  
Organic Light Emitting Devices

AbstractWe report a novel class of emitting materials for use in the organic light-emitting devices (OLEDs): multifunctional phosphorescent dendrimers that have a phosphorescent core and have charge transporting dendrons. We have synthesized first-generation and second-generation dendrimers consisting of a fac-tris(2-phenylpyridine)iridium [Ir(ppy)3] core and hole transporting phenylcarbazole-based dendrons. Smooth amorphous films of these dendrimers were formed by spin-coating them from solutions. The OLEDs using the dendrimer exhibited bright green or yellowish-green emission from the Ir(ppy)3 core. The external quantum efficiency of the OLED using the mixture film of the first-generation dendrimer and an electron-transporting material was as high as 7.6%.

White organic light-emitting devices employing phosphorescent iridium complex as RGB dopants

2007 ◽  
Vol 22 (7) ◽  
pp. 728-731 ◽  
Author(s):  
Ruili Song ◽  
Yu Duan ◽  
Shufen Chen ◽  
Yi Zhao ◽  
Jingying Hou ◽  
...  
Keyword(s):  
Iridium Complex ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

Yellow Organic Light-Emitting Devices Based on Alq Doped DPIHQZn

2013 ◽  
Vol 785-786 ◽  
pp. 563-566
Author(s):  
Yong Hui Gao ◽  
Zhong Qi You ◽  
Wen Long Jiang
Keyword(s):  
Applied Voltage ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Maximum Luminance ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices

The Electroluminescence (EL) characteristics of a novel yellow emitting material (DPIHQZn) were investigated in this paper. The results demonstrated the DPIHQZn with strong emitting and hole-transporting ability. Based on the performance,a series of doping yellow organic light-emitting diodes were fabricated.The yellow devices were fabricated as follows: ITO/ 2T-NATA(40 nm)/NPB(10 nm)/Alq:x%DPIHQZn (35 nm)/Alq (35 nm)/LiF(5 nm)/ Al,x=1,2,3,5;the maximum luminance was 3180 cd/m2at an applied voltage of 15V,while the Commission International de LEclairage coordinates was (0.40,0.48).

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