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Research Highlight

KSJ research group aims to develop and characterize novel functional materials. 

We synthesize novel materials and measure optical, electrical, magnetic, and chemical properties using various methods. Performing both synthesis and characterization enables us to clearly understand the underlying photophysical and photochemical phenomena. Also, we fabricate QLED and infrared photodetectors.

i) Steady-state intraband and interband transitions of Quantum Dots

ii) QLED and IR QD Photodetector

iii) Quantum Plasmon Resonance of Nanocrystals

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iv) Infrared lasing nanomaterials

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Publication
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"Revealing the Self-Doped Nature

of CdxAgySe Quantum Dots

Under Cation Exchange Control"

Chem. Mater. 2025,ASAP

We report cation-exchanged CdxAgySe quantum dots (QDs) at a metastable self-doped state exhibiting intraband transition in the mid-wavelength infrared (mid-IR) regime. The state is successfully captured by controlling the reaction rate of the cation exchange and analyzed using short-wavelength and mid-IR photoluminescence spectroscopy, etc., under cryogenic temperature. The electronic mid-IR intraband transition of the cation-exchanged self-doped quantum dots is further confirmed by measuring the infrared photocurrent spectrum of the QD-based infrared sensor.

Congratulations,  Lee Jin Hyeok on the paper "Revealing the Self-Doped Nature of CdxAgySe Quantum Dots under Cation Exchange Control" published in Chemistry of Materials

이진혁 학생의 논문이 Chemistry of Materials 에 등재되었습니다. 축하합니다!​

​​News
Contact

우리는 반도체 나노결정, 양자물질 및 적외선 물질 연구자입니다.

적외선 QD 양자점/적외선 레이저/적외선 디텍터 및 QD LED 연구에 관심있는 대학원생과

실험물리화학/소재합성/광전자센서소자 전공 Post-doc fellow 를 모집 중입니다.(2026)

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Available position(2026년 1학기)

         : + 대학원생 + 학부연구생 + Post-doc

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We have open positions for passionate graduate students, technicians, and postdocs with backgrounds in chemistry, physics, chemical engineering, material science, and electrical engineering.

kwangsjeong@korea.ac.kr

copyright © 2020 KSJ lab

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