PAPERS

2017

39.
Thermally activated delayed fluorescence OLEDs with fully solution processed organic layers exhibiting nearly 10% external quantum efficiency
Chem. Commun. 53, 2439-2442 (2017)
Ken Albrecht, Kenichi Matsuoka, Daisuke Yokoyama, Yoshiya Sakai, Akira Nakayama, Katsuhiko Fujita, Kimihisa Yamamoto

2016

38.
Fundamental functions of peripheral and core pyridine rings in a series of bis-terpyridine derivatives for high-performance organic light-emitting devices
J. Mater. Chem. C 4, 8980-8988 (2016)
Yuichiro Watanabe, Ryo Yoshioka, Hisahiro Sasabe, Takahiro Kamata, Hiroshi Katagiri, Daisuke Yokoyama, Junji Kido
37.
Syntheses, properties, and OLED characteristics of 2,2'-bipyridine-based electron-transport materials: synergistic effect of molecular shape anisotropy and a weak hydrogen-bonding network on molecular orientation
J. Mater. Chem. C 4, 3699-3704 (2016)
Yuichiro Watanabe, Hisahiro Sasabe, Daisuke Yokoyama, Teruo Beppu, Hiroshi Katagiri, Junji Kido
36.
Excimer emission based on the control of molecular structure and intermolecular interactions
J. Mater. Chem. C 4, 2784-2792 (2016)
Jaehyun Lee, Hyocheol Jung, Hwangyu Shin, Joonghan Kim, Daisuke Yokoyama, Hidetaka Nishimura, Atsushi Wakamiya, Jongwook Park
35.
A series of fluorinated phenylpyridine-based electron-transporters for blue phosphorescent OLEDs
J. Mater. Chem. C 4, 1104-1110 (2016)
Takahiro Kamata, Hisahiro Sasabe, Yuichiro Watanabe, Daisuke Yokoyama, Hiroshi Katagiri, Junji Kido

2015

34.
Photopatterning of indomethacin thin films: a solvent-free vapor-deposited photoresist
ACS Appl. Mater. Interfaces 7, 23398-23401 (2015)
Katherine L. Camera, Jaritza Gomez-Zayas, Daisuke Yokoyama, Mark D. Ediger, Christopher K. Ober
33.
Simple model-free estimation of orientation order parameters of vacuum-deposited and spin-coated amorphous films used in organic light-emitting diodes
Appl. Phys. Express 8, 096601 (2015)
Yoshiya Sakai, Maki Shibata, Daisuke Yokoyama
32.
Advantages and disadvantages of vacuum-deposited and spin-coated amorphous organic semiconductor films for organic light-emitting diodes
J. Mater. Chem. C 3, 11178-11191 (2015) [PDF 3.8MB]
Maki Shibata, Yoshiya Sakai, Daisuke Yokoyama
31.
Anisotropic materials in OLEDs for high outcoupling efficiency
Opt. Express 23, 21128-21148 (2015)
Michiel Koen Callens, Daisuke Yokoyama, Kristiaan Neyts
30.
High fill factor and thermal stability of bilayer organic photovoltaic cells with an inverted structure
Appl. Phys. Lett. 106, 053305 (2015)
Zhongqiang Wang, Ziruo Hong, Taojun Zhuang, Guo Chen, Hisahiro Sasabe, Daisuke Yokoyama, Junji Kido
29.
Extended-gate organic field-effect transistor for the detection of histamine in water
Jpn. J. Appl. Phys. 54, 04DK02 (2015)
Tsukuru Minamiki, Tsuyoshi Minami, Daisuke Yokoyama, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
28.
Simultaneous manipulation of intramolecular and intermolecular hydrogen bonds in n-type organic semiconductor layers: Realization of horizontal orientation in OLEDs
Adv. Opt. Mater. 3 769-773 (2015)
Yuichiro Watanabe, Hisahiro Sasabe, Daisuke Yokoyama, Teruo Beppu, Hiroshi Katagiri, Yong-Jin Pu, Junji Kido

2014

27.
An extended-gate type organic field effect transistor functionalised by phenylboronic acid for saccharide detection in water
Chem. Commun. 50, 15613-15615 (2014)
Tsuyoshi Minami, Tsukuru Minamiki, Yuki Hashima, Daisuke Yokoyama, Tomohito Sekine, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
26.
Excimer formation in organic emitter films associated with a molecular orientation promoted by steric hindrance
Chem. Commun. 50, 14145-14148 (2014)
Jaehyun Lee, Beomjin Kim, Ji Eon Kwon, Joonghan Kim, Daisuke Yokoyama, Katsuaki Suzuki, Hidetaka Nishimura, Atsushi Wakamiya, Soo Young Park, Jongwook Park
25.
Esterification of indoline-based small-molecule donors for efficient co-evaporated organic photovoltaics
J. Phys. Chem. C 118, 14785-14794 (2014)
Zhongqiang Wang, Xiao-Feng Wang, Daisuke Yokoyama, Hisahiro Sasabe, Junji Kido, Zhaoyang Liu, Wenjing Tian, Osamu Kitao, Toshitaka Ikeuchi, Shin-ichi Sasaki
24.
Quantum yield in blue-emitting anthracene derivatives: vibronic coupling density and transition dipole moment density
Phys. Chem. Chem. Phys. 16, 14244-14256 (2014)
Motoyuki Uejima, Tohru Sato, Daisuke Yokoyama, Kazuyoshi Tanaka, Jongwook Park

2013

23.
Synthesis and electroluminescence properties of highly efficient blue fluorescence emitters using dual core chromophores
J. Mater. Chem. C 1, 432-440 (2013)
Beomjin Kim, Youngil Park, Jaehyun Lee, Daisuke Yokoyama, Ji-Hoon Lee, Junji Kido, Jongwook Park
22.
Highly efficient organic p-i-n photovoltaic cells based on tetraphenyldibenzoperiflanthene and fullerene C70
Energy Environ. Sci. 6, 249-255 (2013)
Zhongqiang Wang, Daisuke Yokoyama, Xiao-Feng Wang, Ziruo Hong, Yang Yang, Junji Kido

2012

21.
Wide-range refractive index control of organic semiconductor films toward advanced optical design of organic optoelectronic devices
Adv. Mater. 24, 6368-6373 (2012)
Daisuke Yokoyama, Ken-ichi Nakayama, Toshiya Otani, Junji Kido
Selected as the back cover Website [PDF 2.5MB]
20.
Optical and electrical properties of a squaraine dye in photovoltaic cells
Appl. Phys. Lett. 101, 083904 (2012)
Guo Chen, Daisuke Yokoyama, Hisahiro Sasabe, Ziruo Hong, Yang Yang, Junji Kido
19.
Horizontal orientation of disk-like hole transport molecules and their application for organic light-emitting diodes requiring lower driving voltage
J. Phys. Chem. C 116, 8699-8706 (2012)
Jun-Yun Kim, Daisuke Yokoyama, Chihaya Adachi
18.
Optimizing the charge balance of fluorescent organic light-emitting devices to achieve high external quantum efficiency beyond the conventional upper limit
Adv. Mater. 24, 1765-1770 (2012)
Yong-Jin Pu, Go Nakata, Fumiya Satoh, Hisahiro Sasabe, Daisuke Yokoyama, Junji Kido
17.
High-efficiency simple planar heterojunction organic thin-film photovoltaics with horizontally oriented amorphous donors
Sol. Energy Mater. Sol. Cells 98, 472-475 (2012)
Daisuke Yokoyama, Zhong Qiang Wang, Yong-Jin Pu, Kenta Kobayashi, Junji Kido, Ziruo Hong

2011

16.
Molecular orientation in small-molecule organic light-emitting diodes
Feature Article (invited review)
J. Mater. Chem. 21, 19187-19202 (2011) [PDF 4.0MB]
Daisuke Yokoyama
15.
Dual efficiency enhancement by delayed fluorescence and dipole orientation in high-efficiency fluorescent organic light-emitting diodes
Appl. Phys. Lett. 99, 123303 (2011)
Daisuke Yokoyama, Youngil Park, Beomjin Kim, Sookang Kim, Yong-Jin Pu, Junji Kido, Jongwook Park
14.
An integrated enzyme-linked immunosorbent assay system with an organic light-emitting diode and a charge-coupled device for fluorescence detection
J. Sep. Sci. 34, 2906-2912 (2011)
Hizuru Nakajima, Yukiko Okuma, Kazuhiro Morioka, Mayo Miyake, Akihide Hemmi, Tatsuya Tobita, Masayuki Yahiro, Daisuke Yokoyama, Chihaya Adachi, Nobuaki Soh, Koji Nakano, Shuhua Xue, Hulie Zeng, Katsumi Uchiyama, Toshihiko Imato
13.
Molecular stacking induced by intermolecular C-H...N hydrogen bonds leading to high carrier mobility in vacuum-deposited organic films
Adv. Funct. Mater. 21, 1375-1382 (2011)
Daisuke Yokoyama, Hisahiro Sasabe, Yukio Furukawa, Chihaya Adachi, Junji Kido
12.
Increased light outcoupling efficiency in dye-doped small molecule organic light-emitting diodes with horizontally oriented emitters
Org. Electron. 12, 809-817 (2011)
Jörg Frischeisen, Daisuke Yokoyama, Ayataka Endo, Chihaya Adachi, Wolfgang Brütting
11.
Influence of substituted pyridine rings on physical properties and electron mobilities of 2-methylpyrimidine skeleton-based electron-transporters
Adv. Funct. Mater. 21, 336-342 (2011)
Hisahiro Sasabe, Daisaku Tanaka, Daisuke Yokoyama, Takayuki Chiba, Yong-Jin Pu, Ken-ichi Nakayama, Masaaki Yokoyama, Junji Kido

2010

10.
In situ real-time spectroscopic ellipsometry measurement for the investigation of molecular orientation in organic amorphous multilayer structures
J. Appl. Phys. 107, 123512 (2010)
Daisuke Yokoyama, Chihaya Adachi
9.
Determination of molecular dipole orientation in doped fluorescent organic thin films by photoluminescence measurements
Appl. Phys. Lett. 96, 073302 (2010)
Jörg Frischeisen, Daisuke Yokoyama, Chihaya Adachi, Wolfgang Brütting
8.
Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities
Adv. Funct. Mater. 20, 386-391 (2010)
Daisuke Yokoyama, Yousuke Setoguchi, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

2009

7.
Enhancement of electron transport by horizontal molecular orientation of oxadiazole planar molecules in organic amorphous films
Appl. Phys. Lett. 95, 243303 (2009)
Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi
6.
Thermally activated delayed fluorescence from Sn4+-porphyrin complexes and their application to organic light emitting diodes - a novel mechanism for electroluminescence
Adv. Mater. 21, 4802-4806 (2009)
Ayataka Endo, Mai Ogasawara, Atsushi Takahashi, Daisuke Yokoyama, Yoshimine Kato, Chihaya Adachi
5.
Horizontal orientation of linear-shaped organic molecules having bulky substituents in neat and doped vacuum-deposited amorphous films
Org. Electron. 10, 127-137 (2009)
Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi
Selected as the top 25 most cited articles since 2008 in Org. Electron. Website

2008

4.
Horizontal molecular orientation in vacuum-deposited organic amorphous films of hole and electron transport materials
Appl. Phys. Lett. 93, 173302 (2008)
Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi
3.
Spectrally narrow emissions at cutoff wavelength from edges of optically and electrically pumped organic anisotropic films
J. Appl. Phys. 103, 123104 (2008)
J. Appl. Phys. 104, 039909 (2008)
Daisuke Yokoyama, Masato Moriwake, Chihaya Adachi

~2007

2.
Spectrally narrow emission at cutoff wavelength from edge of electrically pumped organic light-emitting diodes
Jpn. J. Appl. Phys. (Express Lett.), 46, L826-L829 (2007)
Daisuke Yokoyama, Hajime Nakanotani, Yousuke Setoguchi, Masato Moriwake, Dai Ohnishi, Masayuki Yahiro, Chihaya Adachi
1.
Three distinct solvated structures of p-nitroaniline in acetonitrile/CCl4 mixed solvents
Bull. Chem. Soc. Jpn. 72, 389-395 (1999)
Kathaperumal Mohanalingam, Daisuke Yokoyama, Chihiro Kato, Hiro-o Hamaguchi