Tae Min Kang

53.1: Invited Paper: LITI (Laser Induced Thermal Imaging) Technology for High-Resolution and Large-Sized AMOLED

In this paper, we describe a novel color patterning method for the fabrication of high resolution and large format full-color AMOLEDs. Laser Induced Thermal Imaging (LITI) is a laser addressed thermal patterning technology with unique advantages such as excellent transfer film thickness uniformity, multi-layer stack transfer ability, high resolution and scalability to large-Size mother glass. We developed and optimized transfer films, structure of OLED layers, and scanning conditions for the patterning of the evaporated small molecules. As a result, we achieved excellent LITI device stability, which gave the device life time is more than 20,000 hrs with 2.0″ QVGA device architecture for 150 cd/m2 white brightness. As a first step toward the mass production, we set up Gen 4 LITI pilot system.

High efficiency AMOLED using hybrid of small molecule and polymer materials patterned by laser transfer

Abstract Laser‐Induced Thermal Imaging (LITI) is a laser addressed patterning process and has unique advantages such as high‐resolution patterning with over all position accuracy of the imaged stripes of within 2.5 micrometer and scalability to large‐size mother glass. This accuracy is accomplished by real‐time error correction and a high‐resolution stage control system that includes laser interferometers. Here the new concept of hybrid system that complement the merits of small molecule and polymer to be used as an OLED; our system can realize easy processing of light emitting polymers and high luminance efficiency of small molecules. LITI process enables the stripes to be patlerned with excellent thickness uniformity and multi‐stacking of various functional layers without having to use any type of fine metal shadow mask. In this study, we report a full‐color hybrid OLED using the multi‐layered structure consisting of small molecules and polymers.

53.2: Invited Paper: Large‐Area Color‐Patterning Technology for AMOLED

In this paper, we describe a novel color patterning method for the fabrication of large area full-color AMOLEDs. Laser Induced Thermal Imaging (LITI) is a laser addressed thermal patterning technology with unique advantages such as excellent uniformity of transfer film thickness, capability of multilayer stack transfer, high resolution and scalability to large-Size mother glass. We developed and optimized transfer films, structure of OLED layers, and laser scanning conditions for the patterning of evaporated small molecules. As a result, we achieved excellent LITI device stability which yielded the device life time more than 25,000 hrs at 250 cd/m2 white brightness.