Publications

• First-author

1. Nano-Micro Letters x 1, IF: 36.3 (JCR: 1.0 %)_240711

2. Chemical Engineering Journal x 1, IF: 13.2 (JCR: 3.0 %)_251001

3. ACS Applied Materials & Interfaces x 1, IF: 8.2 (JCR: 17.9 %)_240207

4. ACS Photonics x 1, IF: 6.5 (JCR: 11.3 %)_230312

• Co-author

1. Materials Today x 1, IF: 22 (JCR: 3.8 %)_251101

2. Advanced Functional Materials x 1, IF: 19 (JCR: 4.5 %)_230824

3. Nano Energy x 1, IF: 17.1 (JCR: 5.1 %)_2602xx

4. National Science Review x 1, IF: 17.1 (JCR: 5.6 %)_240920

5. Chemical Engineering Journal x 1, IF: 13.4 (JCR: 3.09 %)_230915

6. Progress in Quantum Electronics x 1, IF: 12.5 (JCR: 1.8 %)_2601xx

7. Materials Today Nano x 1, IF: 8.2 (JCR: 17.9 %)_260429

8. Advanced Optical Materials x 1, IF: 7.2 (JCR: 11.6 %)_260205

9. ACS Photonics x 1, IF: 6.7 (JCR: 14 %)_251219

10. Crystal Growth & Design x 1, IF: 3.4 (JCR: 14.6 %)_260224

11. Journal of Information Display x 1, IF: 3.4 (JCR: 48.6 %)_231101

12. IEEE Photonics Journal x 1, IF: 2.4 (JCR: 52.4 %)_230201

In Situ Reduced Pd Nanoparticles Anchored on Graphene-Modified GaN Nanowires for Enhanced Water Splitting  

Jeong-Kyun Oh† with KIST

-, - Preparing

DOI: -

Interface-Engineered AuGa Nanoparticles on GaN Nanowires for High-Performance LSPR Photodetection 

Jeong-Kyun Oh† et al.

-, - Preparing

DOI: -

Photo-Magneto Thermic Effect Augmented Overall Water Splitting Yellow Sea Water Electrolyte

Bagavath Chandran†, Jeong-Kyun Oh†, Sung-Un Kim, Min-Seok Lee, Cheul-Ro Lee and Yong-Ho Ra*

-, - Preparing

DOI: -

Inbuilt Electric Field–Driven Hot-Electron Injection for High-Performance Self-Powered GaN UV Photodetectors 

Bagavath Chandran†, Shuo Han†, Jeong-Kyun Oh†, Dong-Seog Kim, Guen-Jae Oh, Sung-Un Kim, Min-Seok Lee, Jae-Hong Ju, Ha-Neul Eom, Yeon-Tae Yu, Cheul-Ro Lee* and Yong-Ho Ra*

Journal of Materials Science & Technology, IF: 14.3, JCR: 6.8 %

DOI: -

Graphene APTES-mediated Ti-squarate MOF/n-GaN nanowire photoanodes for efficient photoelectrochemical water splitting

Jeong-Kyun Oha,  Sergio Carrascob, SooYeon Rac, Seok-Ho Seod, Bagavath Chandrana, Sung-Un Kima, Min-Seok Leea, Joung-Su Kima, Miriam Vos-Graciab, Sangmin Anc, Dong Ick Sond, Cheul-Ro Leea, Patricia Horcajadab,* and Yong-Ho Raa,*

Advanced Functionl Materials (ISSN: 1616-301X), IF: 19.9, JCR: 4.8 %

DOI: -   [Link]

Artificially Induced Refractive Index Engineering for All-Optical Modal Switching in GaN Nanorod Cavities 

Sung-Un Kim1, Jong-Su Kim1, Min-Seok Lee1,Youngyoon Lim2, Hyungjun Lim2, Joo-Hyung Lee3, Sunghoon Jung3, Jeong-Kyun Oh1, Cheul-Ro Lee1, Hak-Jong Choi2,4,5,*, Jung-Hong Min3,*, Yong-Ho Ra1,*

Applied Physics Reviews, IF: 10.8, JCR: 8.6 %

DOI: -

Highly Durable Nano-Membrane Engineered InGaN/GaN QPs Electrode Architecture for an Efficient Photocathode in Direct Yellow Seawater Splitting

Bagavath Chandran†, Jeong-Kyun Oh†, Jae-Hong Ju, Sung-Un Kim, Min-Seok Lee, Se-Bee Shin, Cheul-Ro Lee* and Yong-Ho Ra*

Journal of Materials Chemistry A, IF: 9.5, JCR: 17.3 %

DOI: -

Dual-Plane Engineered GO-Shielded GaN Core–Shell Nanowires for Cl−- Resilient and Durable Direct Seawater Splitting 

Bagavath Chandran†, Jeong-Kyun Oh†, Sang-Wook Lee†, Sung-Un Kim, Min-Seok Lee, Cheul-Ro Lee and Yong-Ho Ra*

Carbon Energy, IF: 21.4, JCR: 3.4 %

DOI: -

Rapid-sensitive, UV Photodetectors Based on rGO-Wrapped Vertically Aligned GaN Nanowire Heterostructures 

Vignesh Veeramuthu†, Sang-Wook Lee†, Sung-Un Kim†, Dong Ick Son, Jin-Seo Park, Jeong-Kyun Oh, Min-Seok Lee, In-Seo Na, Cheul-Ro Lee and Yong-Ho Ra*

Materials Today Nano (ISSN: 2588-8420), IF: 8.2, JCR: 17.9 %  

DOI: 10.1016/j.mtnano.2026.100834      [Link]  

Facet-Engineered InGaN/GaN Nanorods Grown by Selective-Area MOCVD for Monolithic Multi-Color Emission

Min-Seok Lee†, Sung-Un Kim†, Jeong-Kyun Oh, Dae-Young Um, Jong-Su Kim, Geon-Yeong Kim, Cheul-Ro Lee and Yong-Ho Ra*

Crystal Growth and Design (ISSN: 1528-7483), IF: 3.4, JCR: 14.6 % 

DOI: 10.1021/acs.cgd.5c01475     [Link]  

Localized Laser Recrystallization as an Alternative Route to High-Efficiency Red InGaN Nanowires 

Sung-Un Kim†, Yong-Ho Kim†, Jeong-Kyun Oh,  Sang-Wook Lee, Min-Seok Lee, Jae-Hong Ju, Se-Bee Shin, Jong-Su Kim, Bagavath Chandran,  Cheul-Ro Lee*, Dae-Young Um* and Yong-Ho Ra* 

Advanced Optical Materials (ISSN: 2195-1071), IF: 7.2, JCR: 11.6 %

DOI: 10.1002/adom.202503711     [Link] 

Directionally-emitting single-nanowire CW lasing pixel for ultra-high resolution near-eye displays 

Dae-Yong Um†, Sung-Un Kim†, Vignesh Veeramuthu, Bagavath Chandran, Jeong-Kyun Oh, Yong-Ho Kim, Cheul-Ro Lee and Yong-Ho Ra*

Nano Energy (ISSN: 2211-2855), IF: 17.1, JCR: 5.1 %

DOI: 10.1016/j.nanoen.2025.111642     [Link] 

III-Nitride Nanowire-Based Lasers for Next-Generation Optoelectronic and Display Applications 

Sung-Un Kim†, Min-Seok Lee, Jeong-Kyun Oh, Jong-Su Kim, Geon-Yeong Kim, In-Seo Na, Ha-Neul Eom, Yong-Ho Ra*

Progress in Quantum Electronics (ISSN: 0079-6727), IF: 12.5, JCR: 1.8 %

DOI: 10.1016/j.pquantelec.2025.100597     [Link] 

Optical Mode Localization in Air-Gap-Coupled GaN Nanorod Dimer Cavities  

Sung-Un Kim†, Vignesh Veeramuthu†, Min-Seok Lee, Ja-Yeon Kim2, Jeong-Kyun Oh, Se-bee Shin, Yong-Ho Ra*

ACS Photonics (ISSN: 2330-4022), IF: 6.7, JCR: 14 % 

DOI: 10.1021/acsphotonics.5c02545      [Link] 

Unveiling Quantum Geyser Dynamics: A Breakthrough in Light Enhancement with InGaN Nanorod LED Arrays 

Sung-Un Kim†, Min-Seok Lee†, Vignesh Veeramuthu, Jeong-Kyun Oh, Eun-A Hong2, Ja-Yeon Kim2,* and Yong-Ho Ra*

Materials Today (ISSN: 2211-2855), IF: 22, JCR: 3.8 %

DOI: 10.1016/j.mattod.2025.08.029    [Link] 

Graphene Oxide-Driven Passivation of GaN Nanorods for Enhanced Charge Separation and Durable Seawater PEC Hydrogen Evolution

Jeong-Kyun Oh†, Bagavath Chandran†, Sang-Wook Lee†, Sung-Un Kim, Dae-Young Um, Min-Seok Lee, Rangaswamy Navamathavanb  Cheul-Ro Lee and Yong-Ho Ra*

Chemical Engineering Journal (ISSN: 1385-8947), IF: 13.2, JCR: 3 %

DOI: 10.1016/j.cej.2025.166625   [Link]

Scalable InGaN nanowire u-LEDs: paving the way for next-generation display technology

Veeramuthu Vignesh†, Sung-Un Kim, Sang-Wook Lee, R. Navamathavan, Chandran Bagavath, Dae-Young Um, Jeong-Kyun Oh, Min-Seok Lee, Yong-Ho Kim, Cheul-Ro Lee and Yong-Ho Ra*

National Science Review (ISSN: 2095-5138), IF: 17.1, JCR: 5.6 %

DOI:10.1093/nsr/nwae306   [Link]

Solar-Driven Sustainability: III-V Semiconductor for Green Energy Production Technologies

Bagavath Chandran†, Jeong-Kyun Oh†, Sang-Wook Lee, Dae-Young Um, Sung-Un Kim, Veeramuthu Vignesh, Jin-Seo Park, Shuo Han, Cheul-Ro Lee and Yong-Ho Ra*

Nano-Micro Letters (ISSN: 2311-6706), IF: 36.3, JCR: 1.0 %

DOI: 10.1007/s40820-024-01412-6  [Link]

Low-Leakage Current Core-Shell AlGaN Nanorod LED Device Operating in the Ultraviolet-B Band

Jeong-Kyun Oh†, Dae-Young Um†, Bagavath Chandran†, Sung-Un Kim, Cheul-Ro Lee* and Yong-Ho Ra*

ACS Applied Materials & Interfaces (ISSN: 1944-8244), IF: 8.2, JCR: 17.9 %

DOI: 10.1021/acsami.3c17356  [Link]

III-nitride nanowires for emissive display technology  

Veeramuthu Vignesh†, Yuanpeng Wu, Sung-Un Kim, Jeong-Kyun Oh, Bagavath Chandran,  Dae-Young Um, Zetian Mi* and Yong-Ho Ra*

Journal of Information Display (ISSN: 1598-0316), IF: 3.7, JCR: 40.182 %

DOI: 10.1080/15980316.2023.2282937  [Link]

External catalyst-free InGaN photoelectrode for highly efficient energy conversion and H2 generation  

Dae-Young Um†, Bagavath Chandran†,  Jeong-Kyun Oh, Sung-Un  Kim, Yeon-Tae Yu, Ji-Hyeon Park, Cheul-Ro Lee* and Yong-Ho Ra*

Chemical Engineering Journal (ISSN: 1385-8947), IF: 13.4, JCR: 3.09 %

DOI: 10.1016/j.cej.2023.144997  [Link]

New Charge Carrier Transport-Assisting Paths In Ultra-Long GaN Microwire UV Photodetector 

Dae-Yong Um†, Bagavath Chandran, Ji-Yeon Kim, Jeong-Kyun Oh, Sung-Un Kim, Jong Uk An, Cheul-Ro Lee* and Yong-Ho Ra*

Advanced Functional Materials (ISSN: 1616-301X), IF: 18.5, JCR: 4.1 %

DOI: 10.1002/adfm.202306143   [Link]

Structural Engineering in a Microscale Laser Diode with InGaN Tunnel-Junction Nanorods 

Sung-Un  Kim†, Dae-Young Um†, Jeong-Kyun Oh†, Bagavath Chandran, Cheul-Ro Lee* and Yong-Ho Ra*

ACS Photonics (ISSN: 2330-4022), IF: 6.5, JCR: 11.3 %

DOI: 10.1021/acsphotonics.3c00132  [Link]

Sub-micron monolithic full-color nanorod LEDs on a single substrate

Sung-Un  Kim†, Jeong-Kyun Oh, Dae-Young Um, Bagavath Chandran, Cheul-Ro Lee* and Yong-Ho Ra*

IEEE Photonics Journal (ISSN: 1943-0655), IF: 2.1, JCR: 49.2 %

DOI: 10.1109/JPHOT.2023.3236014  [Link]

광반도체 소자용 나노구조체 제조방법 및 이에 의해 제조된 광반도체 소자용 나노구조체

Cheul-Ro LEE, Jeong-Kyun Oh, Dae-Young Um, Sung-Un Kim, Yong-Ho Ra

국내 특허 

(출원): 10-2023-0034842 (2023.03.16) (등록): 1028036180000 (2025.04.29) 

나노로드 나노광소자 및 이의 제조 방법(Nanorod nano-optical device and manufacturing method thereof)

Yong-Ho Ra, Sung-Un Kim, Dae-Young Um, Jeong-Kyun Oh, Cheul-Ro LEE

국내 특허 

(출원): 1020230002636 (2023.01.09) (등록): -

하이브리드 빨대

임승원, 오정균, 최태호, 이효경, 박슬기, 고현수, 우태규

국내 특허 

(출원): 1020170137080 (2017.10.23)  (등록): 1020072040000 (2019.07.30)