1. CURRICULUM VITAE
Tae-Wook Koh
Prof. Barry P. Rand’s group,
Department of Electrical Engineering, Princeton University, NJ 08544, U.S
+1-609-613-0293, tkoh@princeton.edu
EDUCATION
Princeton University, Princeton, U.S
2013.08 – now Postdoctoral research fellow in Electrical Engineering
Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea
2013.03 – 2013.07 Postdoctoral research fellow in Electrical Engineering
2009.03 – 2013.02 Ph.D. in Electrical Engineering
2007.03 – 2009.02 M.S. in Electrical Engineering
2000.03 – 2007.02 B.S. in Electrical Engineering
DISSERTATION / PUBLICATIONS / PATENTS
“Highly efficient organic light-emitting diodes with enhanced optical efficiencies”
Advisor: Prof. Seunghyup Yoo (Associate Editor of Optics Express)
l Geometrical optics-based structural modifications + thin film optics-based optimization of OLEDs
l Down-conversion white OLEDs with enhanced optical efficiency and high color quality
l 19 publications in high impact peer-reviewed journals, 6 patents worldwide,
12 international conference presentations
l Honor student awards from Dept. of Electrical Engineering, KAIST, 2011
ADDITIONAL RESEARCH EXPERIENCES
l Utilizing Au(0)-Au(I) thiolate metal nanoclusters as orange/infrared emitters in LEDs
l Polynorbornene host materials/copolymers for green/blue/red solution processed OLEDs
l Combining transparent OLEDs with cholesteric liquid crystal panels for transparent displays
l Fabrication/analysis of flexible OLEDs on plastic substrates
Industrial projects participation:
l 2008.08-2009.07: ‘Light extraction enhancement of OLEDs’, supported by Samsung Mobile Display
l 2011.02-2013.02: ‘Outcoupling enhancement in OLEDs by using refractive index arrays and
microlens arrays’, supported by Samsung Display
CORE SKILL SETS
l Thin-film optics/dipole model-based custom MATLAB code writing
l LightTools™ geometric/statistical ray optics simulation / LumericalTM
FDTD simulation tools
l Deposition systems usage/maintenance (vacuum thermal evaporator/DC magnetron sputter)
l Micron-scale photolithography (familiar with UV mask aligner and wet/dry etching processes)
l SEM/TEM/AFM investigations
l Radiometry/Colorimetry/Photometry for analysis of LEDs/OLEDs including human factors
l LabviewTM
programming for electrical/optical analysis

2. Full list of publications
1. T. –W. Koh*, J. A.Spechler*, K. M. Lee, C. B. Arnold, and B. P. Rand, “Enhanced outcoupling in
organic light emitting diodes via a high-index contrast scattering layer”, ACS Photonics (accepted),
2015
(* Authors with equal contribution)
2. J. Lee*, T. –W. Koh*, H. Cho, S. Hofmann, S. Reineke, J. –H. Lee, J. –I. Lee, S. Yoo, K. Leo, and M.
C. Gather, “Color temperature tuning of white organic light-emitting diodes via spatial control of
micro-cavity effects based on thin metal strips”, Org. Electron, 26, 334, 2015
(* Authors with equal contribution)
3. T. -W. Koh, A. M. Hiszpanski, M. Sezen, A. Naim, T. Galfsky, A. Trivedi, Y. -L. Loo, V. Menon, and
B. P. Rand, “Metal nanocluster light-emitting devices with suppressed parasitic emission and
improved efficiency: Exploring the impact of photophysical properties”, Nanoscale 7, 9140, 2015
4. T. -W. Koh, H. Cho, C. Yun, and S. Yoo, “ITO-free down-conversion white organic light-emitting
diodes with structured color conversion layers”, Org. Electron., 13, 3145, 2012
5. T. -W. Koh, J. Choi, S. Lee, and S. Yoo, “Optical outcoupling enhancement in organic light-emitting
diodes: highly conductive polymer as a low-index layer on microstructured ITO electrodes”, Adv.
Mater., 22, 1849, 2010
6. J. Lee*, T. -W. Koh*, H. Cho, T. Schwab, J. -H. Lee, S. Hofmann, J. -I. Lee, S. Yoo, K. Leo, and M.
C. Gather, “Transparent organic light-emitting diodes with different bi-directional emission colors
using color-conversion capping layers”, J. Lumin., 162, 180, 2015
(* Authors with equal contribution)
7. J. Yeon*, T. -W. Koh*, H. Cho, J. Chung, S. Yoo, and J. -B. Yoon, “Actively transparent display
with enhanced legibility based on an organic light-emitting diode and a cholesteric liquid crystal
blind panel”, Opt. Express 21, 10358, 2013
(* Authors with equal contribution)
8. J. H. Park*, T. -W. Koh*, Y. Do, M. H. Lee, and S. Yoo, “Soluble polynorbornenes with pendant
carbazole derivatives as host materials for highly efficient blue phosphorescent organic light-
emitting diodes”, J. Pol. Sci. Part A: Pol. Chem., 50, 2356, 2012 (inside cover article)
(* Authors with equal contribution)
9. J. H. Park*, T. -W. Koh*, J. Chung, S. H. Park, M. Eo, Y. Do, S. Yoo, and M. H. Lee,
“Polynorbornene copolymer with side-chain iridium (III) emitters and carbazole hosts: A single
emissive layer material for highly efficient electrophosphorescent devices”, Macromol. 46, 674,
2013
(* Authors with equal contribution)
10. E. Kim, H. Cho, K. Kim, T. -W. Koh, J. Chung, J. Lee, Y. Park and S. Yoo, “A facile route to
efficient, low-cost flexible organic light-emitting diodes: utilizing the high refractive index and built-
in scattering properties of industrial-grade PEN substrates”, Adv. Mater., 27, 1624, 2015
11. J. Choi, T. -W. Koh, S. Lee, and S. Yoo, “Enhanced light extraction in organic light-emitting devices:
Using conductive low-index layers and micropatterned indium tin oxide electrodes with optimal
taper angles”, Appl. Phys. Lett., 100, 233303, 2012
12. H. -W. Chang, J. Lee, T. -W. Koh, S. Hofmann, B. Lüssem, S. Yoo, C. -C. Wu, K. Leo, and M. C.
Gather, “Bi-directional organic light-emitting diodes with nanoparticle-enhanced light outcoupling”,
Laser Photonics Rev., 7, 1079, 2013
13. J. Lee, H. Cho, T. -W. Koh, S. Hofmann, Y. H. Kim, C. Yun, T. Schwab, S. Reineke, B. Lüssem, J. -I.
Lee, S. Yoo, K. Leo, and M. C. Gather, “Straight-forward control of the degree of micro-cavity
effects in organic light-emitting diodes based on a thin striped metal layer,” Org. Electron. 14, 2444,
2013

3. 14. J. Lee, H. Cho, T. -W. Koh, C. Yun, S. Hofmann, J. -H. Lee, Y. H. Kim, B. Lüssem, J. -I. Lee, K. Leo,
M. C. Gather, and S. Yoo, “Enhanced and balanced efficiency of white bi-directional organic light-
emitting diodes”, Opt. Express 21, 28040, 2013
15. Y. L. Kong, I. A. Tamargo, H. Kim, B. N. Johnson, M. K. Gupta, T. -W. Koh, H. -A. Chin, D. A.
Steingart, B. P. Rand, and M. C. McAlpine, “3D printed quantum dot light-emitting diodes”, Nano
Lett., 14, 7017, 2014
16. C. Yun, H. Cho, T. -W. Koh, J. –H. Kim, J. W. Kim, Y. Park and S. Yoo, “Doping-free inverted top-
emitting organic light-emitting diodes with high power efficiency and near-ideal emission
characteristics”, IEEE Trans. Electron Devices, 59, 159, 2012
17. J. H. Park, C. Yun, T. -W. Koh, Y. Do, S. Yoo and M. H. Lee, “Vinyl-type polynorbornene with 9,9’-
(1,1’-biphenyl)-4,4’-diylbis-9H-carbazole side groups as a host material for highly efficient green
phosphorescent organic light-emitting diodes”, J. Mater. Chem., 21, 5422, 2011
18. H. J. Bae, J. Chung, H. Kim, J. Park, K. M. Lee, T. -W. Koh, Y. S. Lee, S. Yoo, Y. Do and M. H. Lee,
“Deep red phosphorescence of cyclometalated iridium complexes by o-carborane substitution”,
Inorg. Chem., 53, 128, 2014
19. C. S. Choi. D. -Y. Kim, S. -M. Lee, M. S. Lim, K. C. Choi, H. Cho, T. -W. Koh, and S. Yoo, “Blur-
free outcoupling enhancement in transparent organic light-emitting diodes: a nanostructure
extracting surface plasmon modes,” Adv. Opt. Mater. 1, 687, 2013
Registered Patents
1. T. -W. Koh, J. Choi, S. Yoo, S. -H. Lee, G. -H. Lee, and C. -W. Chu, “Organic light emitting device,
lighting apparatus and organic light emitting display apparatus”, US Patent No. 08410477, 2013
2. T. -W. Koh, J. Choi, S. Yoo, S. -H. Lee, G. -H. Lee, and C. -W. Chu, “Organic light emitting device,
lighting apparatus and organic light emitting display apparatus”, JPN Patent No. 5350318, 2013
3. T. -W. Koh, J. Choi, and S. Yoo, “Organic light emitting device, lighting equipment comprising the
same, and organic light emitting apparatus comprising the same”, KOR Patent No. 1012489040000,
2012
4. T. -W. Koh, J. Choi, S. Yoo, S. -H. Lee, G. -H. Lee, and C. -W. Chu, “Organic light emitting device,
lighting equipment comprising the same, and organic light emitting display apparatus comprising the
same”, KOR Patent No. 1010748040000, 2011
5. T. -W. Koh, S. Yoo, S. -H. Lee, C. -W. Chu, G. -H. Lee, “Organic light emitting device, lighting
equipment comprising the same, and organic light emitting display apparatus comprising the same”,
KOR Patent No. 1010841780000, 2011
6. S. H. Park, T. -W. Koh, C. Yun, and S. Yoo, “Transparent organic light emitting diode backlight unit
and transparent full color liquid crystal display using thereof”, KOR Patent 1009322390000, 2009