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Materials Science and Engineering R
"... journal homepage: www.elsevier.com/locate/mser Energetics of metal–organic interfaces: New experiments and assessment ..."
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journal homepage: www.elsevier.com/locate/mser Energetics of metal–organic interfaces: New experiments and assessment
Comparison of the electroluminescence and its related properties of two cyclopentadiene derivatives
, 2002
"... In order to fully understand the dependence of device electroluminescence (EL) on the chemical structure of two light-emitting materials: 1,2,3,4-tetraphenyl-1,3-cyclopentadiene (TPCP) and 1,2,3,4,5-pentaphenyl-1,3-cyclopentadiene (PPCP), their properties in solution and as evaporated thin films of ..."
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In order to fully understand the dependence of device electroluminescence (EL) on the chemical structure of two light-emitting materials: 1,2,3,4-tetraphenyl-1,3-cyclopentadiene (TPCP) and 1,2,3,4,5-pentaphenyl-1,3-cyclopentadiene (PPCP), their properties in solution and as evaporated thin films of UV-Vis absorption, geometric structures, photoluminescence (PL), electrochemistry, glass transition temperature and EL were compared. Compared with that of TPCP, the first absorption band of PPCP shifts to the shorter wavelength region both in solution and thin film state; the photoluminescence in solution exhibits lower quantum efficiency but in thin film state has a higher intensity; the electrochemical oxidation happens at a higher potential; the solid powder exhibits higher glass transition temperature; and the electroluminescent device shows higher luminescence and efficiency. Reasons responsible for the differences were analyzed.
ce M
"... transition from a laboratory scale to an industrial level and an therefore, achieving good device performance depends on several issues, such as electrode characteristics, polymer/electrode inter-duced to control charge injection and charge balance, such as et al. [5] found that ITO acts as a source ..."
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transition from a laboratory scale to an industrial level and an therefore, achieving good device performance depends on several issues, such as electrode characteristics, polymer/electrode inter-duced to control charge injection and charge balance, such as et al. [5] found that ITO acts as a source of oxygen which leads to oxidation causing device aging; therefore, the insertion of the hole-injection-transporting layer is necessary to avoid the direct contact between the emissive LEP layer and ITO as well as to Thin Solid Films 515 (2007facial effect, and LEPmorphological and optoelectronic properties.understanding of the effect of processing on device performance is now paramount. The device performance is mainly concerned with four factors, namely, (i) device efficiency and brightness, (ii) power consumption, (iii) device lifetime, and (iv) colour control [1]. The structure of the PLEDs shown in Fig. 1 consists of several elements, i.e. an emissive component (light emitting polymer, LEP), a hole transporting layer (poly(3,4-ethylenediox-
Charge Carrier Tunneling in the Light-Emitting Diodes of Poly (p-phenylene) Thin Films
, 1999
"... We have studied the temperature dependence of the current-voltage (I-V) and the electroluminescence-voltage (EL-V) characteristics in the blue light-emitting diodes of vacuum-deposited poly (p-phenylene) (PPP) thin films in the temperature range between 14 and 290 K. The onset of the EL occurs at an ..."
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We have studied the temperature dependence of the current-voltage (I-V) and the electroluminescence-voltage (EL-V) characteristics in the blue light-emitting diodes of vacuum-deposited poly (p-phenylene) (PPP) thin films in the temperature range between 14 and 290 K. The onset of the EL occurs at an electric field of about 7×107 V/m, independent of the thickness of the PPP layer. The I-V and EL-V dependences show very weak temperature dependences and fit very well with the Fowler-Nordheim tunneling formula. The results suggest that charge carrier injection is a tunneling process through an energy barrier of about 0.6∼0.8 eV in indium tin oxide (ITO)/PPP/Al devices. I.
Growth and Characterization of OLEDs with Europium Complex as Emission Layer
, 2001
"... How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System ..."
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How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System
