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In this paper, six organic light emitting devices with different quantum well cycles and different position of well structures have been demonstrated. These well structures were composed by N,N′-diphenyl-N,N′-bis(1-napthyl)-1,1′-biphenyl-4,4′-diamine and tris-(8-hydroxyquinoline) aluminum, or tris-(8-hydroxyquinoline) aluminum and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline. The device with one...
Based on the layered optimization scheme, the inorganic/organic hetero-junction devices were prepared and solid state cathodoluminescence (SSCL) were found. According to this mind, blue SSCL of ZnSe film which is not appeared in the traditional sandwich structure was observed. The relationship between spectra characterization and applied conditions were studied in detail. The luminescence mechanism...
Organic light-emitting diodes (OLEDs) with multi-layer periodic (MLP) structure, which consisted of alternative N,N′-bis-(1-naphthyl)-N,N′-1-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) and 4,4′-N,N′-dicarbazole-biphenyl (CBP), were fabricated, where NPB acted as potential barrier and CBP as potential well. Compared with the luminous efficiency of the conventional device with 0-periodic structure, that...
Three mixtures of poly(N-vinylcarbozole) (PVK) doped with 3, 1.5 and 0.1wt% poly [2-methoxy 5-(2-ethylhexyloxy)-p-phenylene vinylene] (MEHPPV) are prepared. The phase-separation in these mixtures has been observed with atomic force microscopy (AFM) and demonstrated by photoluminescence (PL). The transient electroluminescence (EL) of PVK and MEHPPV in mixed PVK polymer light-emitting diodes (PLEDs)...
Blue to white to green light-emitting diodes with structure ITO/PVK:DPPhP(5%)/PBD(xnm)/Alq 3 (5nm)/LiF(0.3nm)/Al have been obtained. DPPhP (1,3-diphenyl-5-(9-phenanthryl)-4,5-dihydro-1-H-pyrazole), which performs good blue-emitting and hole-transporting properties, is synthesized and used as dopant. When the thickness of PBD layer varies from 0 to 5 to 10nm, green to white to blue emission...
We have investigated the dependence on various Ag concentration for photoluminescence (PL) and electroluminescence (EL) of Gd 3 Ga 5 O 12 /Ag thin film, respectively. A rapid quenching of PL is observed above 0.2at.% of Ag concentration due to lattice defects and impurity atoms. However, the optimal concentration of Ag in the EL efficiency is about 1at.%. This may be attributed...
Spatial charges, such as rare earth ions, impurities, vacancies and ionized lattice ions, exist generally in the phosphor layer of thin film electroluminescent displays (TFELD). The influence of these charges on the transport properties of TFELD is investigated for the first time in this article through phase shift analysis and Monte Carlo simulation. Scattering rates of spatial charges are calculated...
The luminescence properties of Zn-rich zinc oxide thin film have been investigated. The luminescence of ZnO:Zn is attributed to the band to band radiative transition and the recombinations at self-activated centers intrinsic to ZnO. The UV and blue electroluminescence emission band centered around 480nm and the broad ultraviolet photoluminescence spectra are observed. The field-induced ionization...
Photoluminescent and electroluminescent properties of poly(2-methoxy-5-nonyloxy-p-phenylene vinylene) (MN-PPV), one of the soluble poly(p-phenylene vinylene) (PPV) derivatives is synthesized through a dehydrochlorination reaction. The EL peak at 576nm with a low threshold voltage in the monolayer structure is independent of the bias. When the Alq 3 layer is very thin (=<10nm) in the bilayer...
We investigated the photoluminescence (PL) quenching of the copolymer, poly(2,5-dimethyl-phenylenevinylene-co-2-methoxy-5-hexyloxy-phenylenevinylen e (DMPPV-co-MHOPPV), focusing on the difference between pure films and copolymer-poly(ethylene oxide) (PEO) blends with and without applied bias in the LEDs. PL quenching of DMPPV-co-MHOPPV is decreased by dispersion in an inert host, PEO. Results show...
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