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46.2: Finite‐Source Dye‐Diffusion Thermal Transfer for Doping and Color Integration in Organic Light‐Emitting Diodes and Displays
Author(s) -
Wu C. C.,
Yang C. C.,
Chen C. W.,
Chang H. H.,
Lee C. C.
Publication year - 2000
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1832852
Subject(s) - oled , materials science , doping , dopant , diffusion , optoelectronics , thermal transfer , light emitting diode , diode , thermal , diffusion process , thermal diffusivity , polymer , process (computing) , nanotechnology , composite material , thermodynamics , computer science , innovation diffusion , knowledge management , physics , layer (electronics) , operating system
A reliable and effective process of performing controllable doping of polymer films in organic light‐emitting devices is reported. In this approach, a film to be doped is brought into direct contact with a dye‐dispersed polymer donor film to permit direct dye‐diffusion thermal transfer. Theoretical and experimental studies indicate that this doping process can be modeled by Fick's diffusion theory and that a desired dopant distribution from shallow to flat profiles may be obtained in a single transfer step by adjusting the diffusion conditions. Dopedpolymer light‐emitting devices made by this process and the conventional blending process exhibited same device characteristics. Along with patterned color donor plates, multicolor OLEDs of arbitrary patterns were demonstrated with a single thermal transfer step.