Seoul National University · Materials Science
Professor Jae Pil Kim's research lab specializes in the design and development of advanced optoelectronic materials, with a focus on organic semiconductors, luminescent dyes, and light-harvesting systems. Key research directions include triplet-triplet annihilation upconversion for efficient solar energy conversion, high-efficiency phosphors and encapsulation strategies for white LEDs, and the development of responsive dyes for optical sensing applications—particularly CO₂ detection using ionic liquids and BODIPY-based fluorophores. The lab also investigates the structure-property relationships of squaraine dyes and their integration into stable, high-transmittance polymer films for optoelectronic devices.
Figures are computed from collected data and may differ slightly.
Abstract Designing optimized systems for triplet‐triplet annihilation upconversion (TTA‐UC) with high UC emission efficiency at low power densities remains challenging. To improve the lifetime of triplet photosensitizers for TTA‐UC, donor‐acceptor‐heavy atoms were used to synthesize rotationally restricted PY‐MBD‐BR and unrestricted PY‐BD‐BR photosensitizers. The singlet oxygen quantum yields of both photosensitizers was ≈0.60 due to their structural similarity, except for the degree of rotation
The effects of the refractive index of an encapsulant on the light-extraction efficiency (LEE) of white light-emitting diodes (LEDs) are studied. A dome-type blue LED with a high-refractive-index encapsulant (HRE) shows a higher LEE compared to that of a low-refractive-index encapsulant (LRE). In a flat-type surface-mounted device (SMD) package, however, an LED with LRE shows a higher LEE than an LED with the HRE. These results stem from differences in the total internal reflection at the interf
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