A method for selective directional deposition of organic thin films

Abstract

The invention discloses a selective directional deposition method of an organic thin film, comprising the following steps: connecting a thin film transistor drive circuit of an AMOLED substrate in series to an electrolytic cell circuit for electrochemical deposition; controlling the on-off state of the electrolytic cell circuit through the thin film transistor drive circuit , at the same time the electrochemical workstation outputs an electrodeposition signal; an organic film is deposited on the corresponding pixel electrode of the electrolytic cell circuit in the electrified state. Through the adjustment of the control circuit and the replacement of the electrolyte, the invention can sequentially deposit red, green, and blue light-emitting films to prepare color patterns, and provides a simple and economical colorization technology for the pixel preparation of organic light-emitting diodes (OLEDs) .

Description

technical field [0001] The invention relates to the field of photoelectric materials, in particular to a selective directional deposition method of an organic thin film. Background technique [0002] The full colorization of the display is an important sign to test whether the display is competitive in the market. Using red, green, and blue (RGB) light-emitting materials to emit light independently is the most widely used colorization mode at present. This technology needs to make RGB light-emitting sub-pixels separately. The patterning process is relatively complicated, and it occupies a large proportion in the production cost of the device (50 %). At present, the most commonly used technique for the preparation of organic thin films is metal mask evaporation, which is suitable for organic small molecule materials that are easy to sublimate. Plating red, green and blue three primary color light-emitting layers to achieve patterning, this technology is simple and mature, a...

AI Technical Summary

Problems solved by technology

At present, the most commonly used technique for the preparation of organic thin films is metal mask evaporation, which is suitable for organic small molecule materials that are easy to sublimate. Plating red, green and blue three primary color light-emitting layers to achieve patterning, this technology is simple and mature, and has been widely used in the preparation of organic light-emitting diode (OLED) display screens, but the equipment used is complex, costly, and material waste is serious. In addition, the metal shadow mask etching technology directly affects the screen resolution and picture quality of the display screen. Limited by the metal etching technology, the patterning accuracy of the mask evaporation technology can only reach the level of tens of microns to several microns. , and the thickness of the high-resolution metal mask is very thin, making it difficult to accurately align in a large-size display

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