Solvent-enhanced dye diffusion in polymer thin films for color tuning of organic light-emitting diodes
نویسندگان
چکیده
A method of solvent-enhanced dye diffusion in polymer films for organic light-emitting diode ~OLED! application is introduced. After an initial dye transfer from a dye source substrate into the top of the device polymer film, the device substrate is then exposed to solvent vapor. Due to solvent absorption by the polymer film, the glass transition temperature of the polymer is significantly decreased which leads to enhanced diffusion of the dye in the polymer film. Secondary ion mass spectroscopy and depth dependent photoluminescence show that the temperature for dye diffusion can be decreased by at least 100 °C, to room temperature. OLEDs with 0.6% external quantum efficiency have been demonstrated with this method using the polymer poly~9-vinylcarbazole! combined with electron transport molecules and the dyes coumarin 47 and coumarin 6. © 2001 American Institute of Physics. @DOI: 10.1063/1.1366368#
منابع مشابه
Solvent-enhanced Dye Diffusion in Polymer This-Films for OLED Application
A method of solvent-enhanced dye diffusion in polymer films for organic light-emitting diode (OLED) application is introduced. After an initial dye transfer from a dye source substrate into the top of the electractive polymer film, the device substrate is then exposed to solvent vapor. Due to solvent absorption by the polymer film, the glass transition temperature of the polymer is significantl...
متن کاملAnomalous Temperature Dependence of Solvent-Enhanced Dye Diffusion In Polymer Films
One promising method to pattern full color polymer Organic Light-Emitting Diode (OLED) displays is to print dye from a pre-patterned organic film onto a spin-cast polymer and then diffuse the dye into the film at room temperature in a solvent vapor environment. This method utilizes the well-known tendency for a polymer film to absorb solvent vapor, which depresses the glass transition temperatu...
متن کاملThin-film Encapsulation of Organic Light-Emitting Diodes Using Single and Multilayer Structures of MgF2, YF3 and ZnS
In this research, the lifetime of green organic light emitting diodes (OLEDs) is studied using four passivation layers. To encapsulate the OLEDs, MgF2, YF3, composed of alternating MgF2/ZnS and YF3/ZnS layers were grown by thermal vacuum deposition. Measurements show that the device lifetime is significantly improved by using YF3 and ZnS as passivation layers. However, diodes encapsulated by Mg...
متن کاملOrganic and Molecular Electronics
Over recent years, a wide variety of challenges aiming for electrical pumping of organic laser diodes have been addressed. However, organic laser diodes have difficulty gaining widespread application due to their high lasing thresholds under electrical pumping. A variety of organic semiconductors have been developed to reduce the lasing threshold, which include not only small molecular material...
متن کاملTowards Flexible Full-color Active Matrix Organic Light-emitting Displays: Dry Dye Printing for Oled Integration and 280°c Amorphous-silicon Thin-film Transistors on Clear Plastic Substrates
The goal of this thesis is to achieve flexible full color AMOLED displays on clear plastic substrates using high temperature amorphous-silicon TFT’s. Dry dye-printing and solvent-enhanced dye diffusion were used to fabricate side-by-side red, green and blue organic light emitting device (OLED) pixels. The technique was then used to make combined polymer/small molecule devices, in which the prin...
متن کامل