Professor Kim Seonghun of Dong-Eui University Replaces Inkjet Method with High-Density Perovskite Thin Film Fabrication Based on Vapor Deposition Method

Professor Kim Seong-hoon of Dong-Eui University, the first author of the high-efficiency display manufacturing technology, and Na-eun Moon, a master's student and co-author, are taking a commemorative photo.

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[Asia Economy Yeongnam Reporting Headquarters Reporter Hwang Du-yeol] Professor Kim Seong-hoon’s team from the Department of Applied Chemistry at Dong-Eui University has developed a ‘high-density perovskite thin film manufacturing technology’ using a vapor deposition method that can replace the inkjet printing technique used in color display manufacturing.

To realize color displays, three colors?red, green, and blue?are required, and a method that uses a blue backlight to convert to green or red is commonly used.

So far, in the field of flat panel displays, when examining color conversion systems using fluorescent materials, the use of color filters is essential in most forms, including advanced technologies such as inkjet printing.

Recently, new display technology has been reported that applies a QD-OLED hybrid system combining quantum dots (QD, wavelength conversion layer) and blue OLED (backlight), eliminating the need for liquid crystals.

However, there are still drawbacks such as the need to increase the thickness of the quantum dot layer or use additional color filters to achieve perfect color conversion without blue light leakage.

Professor Kim Seong-hoon’s team developed a high-density quantum dot film manufacturing technology using vapor deposition to overcome these drawbacks.

The developed technology perfectly converts blue to green and red at a thickness of 3μm, about 25% of the thickness produced by the existing inkjet method, enabling a reduction in the bank height used in displays and the realization of three colors without color filters.

This technology is expected to enhance the luminance performance of displays and contribute to reducing manufacturing costs.

Professor Kim Seong-hoon said, “This will be widely used as a revolutionary method that lowers bank height in display manufacturing and can replace the inkjet printing technique, which requires difficult nozzle control.”

The results were published under the title “Highly thin film with aerosol-deposited perovskite quantum dot/metal oxide composite for perfect color conversion and luminance enhancement” in the Chemical Engineering Journal (IF 13.272, JCR 97.55%), a journal in the field of chemical engineering processes, on the online edition dated the 23rd.

The paper lists Professor Kim Seong-hoon of Dong-Eui University as the first author, with master’s student Moon Na-eun as a co-author. Research teams led by Professor Kim Sang-wook of Ajou University, Professor Oh Jong-min of Kwangwoon University, and Professor Yoo Seung-hyup of KAIST also participated in the development.

The research was supported by the National Research Foundation of Korea’s Individual Basic Research Program.

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