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Graded doped structure fabricated by vacuum spray method to improve the luminance of polymer light-emitting diodes

Nano-Micro Letters 2009年第1期1卷 19-22页

作者： X.Mo T.Mizokuro C.Heck N.Tanigaki T.Hiraga Materials Science Department Fudan University Photonics Research Institute National Institute of Advanced Industrial Science and Technology

An increase in luminance of a polymer light-emitting diode(PLED) was obtained by fabricating a graded doping structure using a vacuum spray method. The small electron transport molecule, Tris(8-hydroxyquinolinato) aluminum(III)(Alq3), was graded dispersed along the film in the direction of growth in the hole transport polymer poly(3-hexylthiophene-2,5-diyl)(P3HT, regiorandom) layer of the PLED, despite being dissolved in the same organic solvent as the polymer. The PLED reported here, which is composed of a graded structure, emitted brighter light than PLEDs composed of pure polymer or of a blend of active layers prepared by spin coating and/or vacuum spray methods.

关键词： Polymer light-emitting diodes Luminance Graded doped vacuum spray

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Study of the beam injecting process of solution spray under vacuum conditions

Study of the beam injecting process of solution spray under ...

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第18届国际真空大会

作者： Han Yu Jian Xiaohui Sun Yue Ba Dechun and Li Jianchang* vacuum and fluid engineering research center Northeastern University Shenyang 110004 China

In this work, we theoretically study the droplet breakup of vacuum spray beam. We choose a pinhole nozzle, chloroform solution and chamber pressure of 10 Pa. According to the solution flowing characteristics in the nozzle, the calculated Reynolds number Re h is larger than 2320. By setting the boundary conditions, we get the distribution of velocity, flow of per unit area and the flow rate is 1160 m / s. With the assumption that the solution flow pattern in the pinhole nozzle is circular jet, we find that: 1) The flow velocity in the nozzle is very high;2) The flow regime is turbulent;3) The solution atomizes as soon as it sprays out of the nozzle;4) The spray cone angle θ is 23o . The atomization occurs immediately after the solution is sprayed out of the nozzle. The droplet break-up model was built and modified on the basis of fluctuation break-up model. The basic parameters are as follows: the density of the solution ρ l, the fluid flow Q , the nozzle velocity v0 , the droplet diameter d 0. At the site x mm away from the nozzle mouth, the mass of the evaporated droplet is m x, and the diameter is d x. It is permitted to ignore the influences of air and gravity under vacuum conditions. We can then reasonably assume that the droplets move with constant velocity. Assuming that the droplet diameter is equal, and the solution don’t volatilize, one finds the following equation ρ l Qv0 =P1. Here, P1 is the momentum of the droplets at the x point. The droplet diameter distribution is consistent with that of the maximum entropy diameter distribution. In fact, the droplets begin to volatilize immediately after breaking-up. Accounting for this factor, the droplet momentum at site of x does not accord with the law of conservation of momentum. It is thus necessary to introduce a momentum P2 representing that of the volatilized solvent. We assume that P2 and the power of the pump are in a dynamic equilibrium. From the reported experimental results, we know that the final diame

关键词： Polymer thin film Optoelectronic device vacuum spray Organic electronics Solar cell.

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