- Organic Light Emitting Diodes, Quantum Dot Light Emitting Diodes
- Flexible Electronics and Photonics

Ph.D (Flexible and Printable Electronics ), Jeonbuk National University (JBNU), Korea 2019

(28) "Solvent Engineering and Vacuum Annealing Synergy for Efficient Ambient Inkjet-Printed PHOLEDs" S. Chowdhury, K.-J. Ko, V.V. Satale, W. Zhou, J.-W. Kang* Macromolecular Research, In Press(2025. 09. 29)

(27) "Low-Temperature ALD-Grown SnOx Interlayer for Scalable and Stable p-i-n Perovskite Solar Cells and Modules" A. Mohamed, H.B. Lee, V.V. Satale, K.-J. Ko, B. Tyagi, D.-H. Kim, J.-W. Kang* Sustainable Energy & Fuels, In Press (2025. 12. 08)

(26) "Tunable and Patternable QD Emissive Layers via Spray-Driven Surface Halide Exchange" W. Zhou, S. He, K. Ko, S. Chowdhury, J.-W. Kang* ChemNanoMat, In Press (2025. 12. 24)

(25) "Ambient Inkjet-Printed PHOLEDs with Record Efficiency via Dual-SAM Engineering and Eco-Friendly Solvent Design" S. Chowdhury, K. Ko, V.V. Satale, H. Kim, S.-H. Jin*, J.-W. Kang*, Materials Today, In Press (2025. 12 22)

(24) "High-Performance perovskite quantum dots light-emitting diodes with hole transport layer engineering and synergetic outcoupling enhancement" S. He, W. Zhou, S. Ham, K.-J. Ko, J. Luo, B.-J. Lee, H.B. Lee*, J.-H. Lee* and J.-W. Kang* Applied Surface Science, 680, 161384 (2025)

(23) "The Role of the Bottom Oxide Layer in Oxide-Metal-Oxide (OMO) Electrode for Stretchable Organic Light-Emitting Diodes" Chang Min Lee, Yeong Beom Kim, Subrata Sarker, Dong Hyun Kim, Tae Wook Kim, Syed Hamad Ullah Shah, Hyun Woo Cho, Tae-Sung Bae, Seung Min Yu, Yong-Cheol Kang, Sangmin Han, P. Justin Jesuraj*, Keum-Jin Ko*, Myungkwan Song, Chang-Su Kim, Seung Yoon Ryu*
Advanced Materials Interfaces, 11, 2300652 (2024)

(22) "Impact of Ternary Solvent on the Grain Size and Defects of Perovskite Layer to Realize a Stable Morphology for Efficient Inverted Solar Cells" Chang Min Lee, Syed Hamad Ullah Shah, Keum-Jin Ko, Dong Hyun Kim, Tae Wook Kim, Hyun Woo Cho, Yeong Beom Kim, Jae Woo Lee, Kiseok Heo, Chul Hoon Kim, Hyun Jae Lee, Gyudo Lee, Seokbeom Roh, Sanghyuk Park, Sang Geul Lee, Tae-Sung Bae, Seung Min Yu, Jong Sung Jin, Heehun Moon, Amjad Islam, P. Justin Jesuraj, Myungkwan Song, Chang-Su Kim, Seung Yoon Ryu, Solar RRL, 7, 2300604 (2023)

(21) "High-Performance perovskite quantum dots light-emitting diodes with hole transport layer engineering and synergetic outcoupling enhancement" S. He, W. Zhou, S. Ham, K.-J. Ko, J. Luo, B.-J. Lee, H.B. Lee*, J.-H. Lee* and J.-W. Kang* Applied Surface Science, 680, 161384 (2025)

(20) "Indium-free, highly flexible semi-transparent organic light-emitting diodes featuring MoO3/Au/MoO3 multilayer anode and cathode" K.-J. Ko*, H.W. Cho, H.B. Lee, P.J. Jesuraj, J.-W. Kang*, S.Y. Ryu*
Organic Electronics, 128, 107022 (2024)

(19) "Optical Engineering of FAPbBr3 Nanocrystals via Conjugated Ligands for Light-Outcoupling Enhancement in Perovskite Light-Emitting Diodes" S. He, H.B. Lee, K.-J. Ko, N. Kumar, J.-H. Jang, S.-O. Cho, M. Song, W. Zhou, B.-J. Lee, J.-H. Lee* and J.-W. Kang* Adv. Opt. Mater. 11, 2300486 (2023)

(18) “Flexible, stripe-patterned organic solar cells and modules based on multilayer-printed Ag fibers for smart textile applications” M.M. Ovhal, H.B. Lee, S. Boud, K.-J. Ko, W.-Y. Jin, N. Kumar, B. Tyagi, J.-W. Kang* Materials Today Energy, 34, 101289 (2023)

(17) "Realizing full-color perovskite quantum dots light-emitting diodes via contemporary surface ligand/anion engineering" S He, HB Lee, N Kumar, KJ Ko, M Song, W Kim, JW Kang, Materials Today Chemistry 26, 101012(2022)

(16) "Blue Light Emitting Diodes based on Bright Quasi‐Type‐II ZnO@ 1‐Aminopyrene Hybrid Quantum Dots with a Long Operation Life" HH Kim, S Park, KJ Ko, SY Yim, JW Kang, WK Choi
Advanced Optical Materials 10 (18), 2200601(2022)

(15) "High-performance, large-area semitransparent and tandem perovskite solar cells featuring highly scalable a-ITO/Ag mesh 3D top electrodes" B. Tyagi, H.B. Lee, N. Kumar, W.-Y. Jin, K.-J. Ko, M.M. Ovhal, R. Sahani, H.-J. Jung, J. Seo, J.-W. Kang* Nano Energy 95, 106978(2022)

(14) "Trifluoromethyl‐Group Bearing, Hydrophobic Bulky Cations as Defect Passivators for Highly Efficient, Stable Perovskite Solar Cells" H.B. Lee, N. Kumar, V. Devaraj, K.-J. Ko, S. He, B. Tyagi, J.-W. Oh*, J.-W. Kang* Solar RRL 5 (12), 2100712(2021)

(13)"Tailoring the refractive index and surface defects of CsPbBr3 quantum dots via alkyl cation-engineering for efficient perovskite light-emitting diodes" S He, N Kumar, HB Lee, KJ Ko, YJ Jung, JI Kim, S Bae, JH Lee, JW Kang, Chemical Engineering Journal 425, 130678(2021)

(12)"Roll-to-roll 3D printing of flexible and transparent all-solid-state supercapacitors" MM Ovhal, N Kumar, HB Lee, B Tyagi, KJ Ko, S Boud, JW Kang, Cell Reports Physical Science 2 (9), 100562(2021)

(11) "Fabrication of an oxide/metal/oxide structured electrode integrated with antireflective film to enhance performance in flexible organic light-emitting diodes" K.-J. Ko, S.-R. Shin, H.B. Lee, E. Jeong, Y.J. Yoo, H.M. Kim, Y. M. Song*, J. Yun*, J.-W. Kang* Materials Today Energy 20, 100704(2021)

(10) "Dimensionality and defect engineering using fluoroaromatic cations for efficiency and stability enhancement in 3D/2D perovskite photovoltaics" HB Lee, N Kumar, B Tyagi, KJ Ko, JW Kang, Solar RRL 5 (3), 2000589(2021)

(9) "Flexible organic light emitting diodes based on bifunctional BaTiO3 nanoparticles embedded polymer substrate-light extractor" KJ Ko, HB Lee, M Jang, MH Lee, JW Kang, Molecular Crystals and Liquid Crystals 706 (1), 21-29(2020)

(8) "Flexible, wearable organic light‐emitting fibers based on PEDOT: PSS/Ag‐fiber embedded hybrid electrodes for large‐area textile lighting" KJ Ko, HB Lee, JW Kang, Advanced Materials Technologies 5 (6), 2000168(2020)

(7) "Realization of excitation wavelength independent blue emission of ZnO quantum dots with intrinsic defects" H.H. Lee, Y. Lee, Y.J. Lee, J. Jeong, Y. Yi, C. Park, S.-Y. Yim, B. Angadi, K.-J. Ko, J.-W. Kang, W.K. Lee* ACS Photonics 7 (3), 723-734(2020)

(6) "Electrical, Optical, and Structural Characteristics of CH3NH3PbI3 Perovskite Light‐Emitting Diodes" M Oh, SI Jo, B Parida, A Singh, K Ko, JW Kang, H Kim, physica status solidi (a) 215 (20), 1701014(2018)

(5) "Two-step “seed-mediated” synthetic approach to colloidal indium phosphide quantum dots with high-purity photo-and electroluminescence" P Ramasamy, KJ Ko, JW Kang, JS Lee, Chemistry of Materials 30 (11), 3643-3647(2018)

(4) "High-performance, color-tunable fiber shaped organic light-emitting diodes" KJ Ko, HB Lee, HM Kim, GJ Lee, SR Shin, N Kumar, YM Song, JW Kang, Nanoscale 10 (34), 16184-16192(2018)

(3) "Improving light extraction of flexible OLEDs using a mechanically robust Ag mesh/ITO composite electrode and microlens array" SR Shin, HB Lee, WY Jin, KJ Ko, S Park, S Yoo, JW Kang, Journal of Materials Chemistry C 6 (20), 5444-5452(2018)

(2) "Ultra-smooth, fully solution-processed large-area transparent conducting electrodes for organic devices" WY Jin, RT Ginting, KJ Ko, JW Kang, Scientific Reports 6 (1), 1-10(2016)

(1) "Flexible, Stripe-Patterned Organic Solar Cells and Modules Based On Multilayer-Printed Ag Fibers for Smart Textile Applications" MM Ovhal, HB Lee, S Boud, KJ Ko, WY Jin, N Kumar, B Tyagi, JW Kang, Available at SSRN 4330032