Space-Charge-Limited Charge Injection From Ito/Ppv Into A Trap-Free Molecularly Doped Polymer

1993 ◽  
Vol 328 ◽  
Author(s):  
H. Antoniadis ◽  
M. Abkowitz ◽  
B. R. Hsieh ◽  
S. A. Jenekhe ◽  
M. Stolka
Keyword(s):  
Space Charge ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Dark Current ◽  
Phenylene Vinylene ◽  
Electroluminescent Devices ◽  
Hole Transporting ◽  
Novel Method ◽  
Doped Polymer ◽  
Space Charge Limited

ABSTRACTWe describe bilayer structures comprised of a poly (p-phenylene vinylene) (PPV) layer and a trap-free diaryldiamine (TPD) doped in polycarbonate (PC) layer, sandwiched between indium-tin-oxide (ITO) and aluminum (Al) contacts. Two critical phenomena in the operation of polymer based electroluminescent devices, interface injection and carrier range, are investigated. It is established that the ITO/PPV contact is capable of sustaining dark current under trap-free space-charge-limited (TFSCL) conditions into a hole transporting TPD:PC layer. TFSCL currents are not observed in devices without the PPV layer. Upon increasing the thickness of the PPV layer a deviation from the TFSCL regime is observed which is attributed to trapping of the injected holes within PPV. These observations suggest a novel method for estimating the trapping Mobility-lifetime product μτ for holes in PPV. By this means we estimate μτ ∼ 10−9 cm2/V.

scholarly journals Thickness scaling of the space-charge-limited current in poly(p-phenylene vinylene)

2005 ◽  
Vol 86 (9) ◽  
pp. 092105 ◽  
Author(s):  
P. W. M. Blom ◽  
C. Tanase ◽  
D. M. de Leeuw ◽  
R. Coehoorn
Keyword(s):  
Space Charge ◽  
Phenylene Vinylene ◽  
Space Charge Limited Current ◽  
Limited Current ◽  
Space Charge Limited

Decreased degradation of poly(p-phenylene vinylene) films at the indium–tin oxide interface

2010 ◽  
Vol 46 (8) ◽  
pp. 2644-2648 ◽  
Author(s):  
L. C. Poças ◽  
S. L. Nogueira ◽  
R. S. Nobuyasu ◽  
Gustavo G. Dalkiranis ◽  
M. J. M. Pires ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Phenylene Vinylene ◽  
Oxide Interface

Blue and White Organic Light-Emitting Devices Using 2,5-Diphenyl -1, 4-Distyrylbenzene with Two Trans-Double Bonds as a Blue Emitting Layer

2005 ◽  
Vol 475-479 ◽  
pp. 1805-1808
Author(s):  
Gang Cheng ◽  
Zengqi Xie ◽  
Ying Fang Zhang ◽  
Yuguang Ma ◽  
Shi Yong Liu
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Maximum Efficiency ◽  
Double Bonds ◽  
Yellow Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices

A novel derivative of oligo(phenylenvinylene) (OPV), 2,5-diphenyl -1, 4-distyrylbenzene with two trans-double bonds (trans-DPDSB), is used as a blue emitting material in blue and white organic light-emitting devices (OLEDs). Blue devices with a configuration of indium-tin oxide (ITO)/N,N´-diphenyl-N,N´-bis(1-naphthyl)-(1,1´-biphenyl)-4,4´-diamine (NPB)/ trans-DPDSB / tris (8-hydroxyquinoline) aluminum (Alq3)/LiF/Al are constructed, where NPB, Alq3 and trans-DPDSB are used as hole-transporting, electron-transporting and light-emitting layers, respectively. The color of emission is changed from blue-green to pure blue when the trans-DPDSB layer is thicker. By inserting an ultrathin 5,6,11,12-tetraphenylnaphthacene (rubrene) yellow light-emitting layer between the Alq3 and trans-DPDSB layers, white OLEDs are obtained. The maximum efficiency and luminance of the blue and white devices are 1.2, 3.0 cd/A, and 1400, 7000 cd/m2, respectively.

Study of 2,6-Linked Quinquepyridine Derivative as Luminescence Materials

2000 ◽  
Vol 660 ◽  
Author(s):  
Y.J. Fu ◽  
T.K.S. Wong ◽  
G.M. Wang ◽  
X. Hu ◽  
S. Buddhudu ◽  
...  
Keyword(s):  
Solid State ◽  
Double Layer ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Single Layer ◽  
Charge Balance ◽  
Pl Spectra ◽  
Hole Transporting ◽  
Two Peaks

ABSTRACTBoth photoluminescence (PL) and electroluminescence (EL) properties of 6,6””-dimethyl-4', 4”'-diphenyl-2,2':6',2”:6”,2”':6”',2””-quinquepyridine (DMDPQPY), a 2,6-linked oligopy- ridine derivative, have been investigated. Two maxima are observed from its PL spectra in solid state, but only one peak appears in its PL in solutions. Emission from the single layer device with indium-tin-oxide (ITO) and Al as the respective anode and cathode (ITO/DMDPQPY/Al) is very weak, but introduction of a hole transporting layer polyvinylcarbazole (PVK), in the double layer device (ITO/PVK/DMDPQPY/Al), increases the luminance significantly indicating a better charge balance. Two peaks appear in the EL spectra, one at 419 nm and another at 536 nm, ascribed to PVK and DMDPQPY respectively.

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