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| 1 | Simultaneous enhancement of efficiency and stability of OLEDs with thermally activated delayed fluorescence materials by modifying carbazoles with peripheral groups显示文摘Albeit their high efficiencies, the operational stability of the organic light emitting diodes(OLEDs) based on thermally activated delayed fluorescence(TADF) emitters is still far from satisfaction, and few strategies have been proposed to improve their stability. Here, we show that by modifying the carbazole unit, one of the most commonly used donors in TADF emitters, with peripheral groups, both the device efficiency and operational stability can be greatly improved. Awell-known TADF molecule—4,5-di(9H-carbazol-9-yl)phthalonitrile(2CzPN) was chosen as the prototype and modified by introducing peripheral tert-butyl and phenyl groups to the 3,6-positions of the carbazole(named 2tBuCzPN and 2PhCzPN, respectively). The introduced groups not only improve the compounds' electrochemical stabilities referred to the cyclic voltammetry multi-sweep results, but also promote their photoluminescence quantum yields. Furthermore, reduced singlet-triplet energy gaps are observed, leading to the shortened exciton lifetimes which are benefit to suppress the exciton annihilations. Besides, the steric hindrance of introduced phenyl groups can partly restrain the concentration quenching of the TADF emitter. Consequently, OLEDs based on 2tBuCzPN and 2PhCzPN achieved improved maximum external quantum efficiencies(EQEs) of 17.0% and 14.0%, respectively(compared to 8.5% for 2CzPN). Meanwhile, 2PhCzPN based OLED showed reduced roll-off characteristics and a longer lifetime of 7.8 times higher than that of 2CzPN, testifying the effectiveness of subtle modification of the unstable moieties in simultaneous enhancement of efficiency and stability of OLEDs based on TADF emitters. | Yunge Zhang Dongdong Zhang Taiju Tsuboi Yong Qiu Lian Duan | 2019 | Science China Chemistry2019，62，3： | 3 |
| 2 | Forming Condition and Geology Prediction Techniques of Deep Clastic Reservoirs显示文摘1 Introduction As new exploration domain for oil and gas,reservoirs with low porosity and low permeability have become a hotspot in recent years(Li Daopin,1997).With the improvement of technology,low porosity and | QIAN Wendao YIN Taiju ZHANG Changmin HOU Guowei HE Miao Xia Min Wang Hao | 2017 | Acta Geologica Sinica(English Edition)2017，91，S1： | 2 |
| 3 | Optical spectroscopy of heavily Ho3+-doped BaY2F8 crystals显示文摘 | Taiju Tsuboi Kyoung Hyuk Silviu Polosan | 2010 | Journal of Luminescence2010，131，4： | 1 |
| 4 | High color rendering index white organic light-emitting diode using levofloxacin as blue emitter显示文摘Levofloxacin(LOFX), which is well-known as an antibiotic medicament, was shown to be useful as a 452-nm blue emitter for white organic light-emitting diodes(OLEDs). In this paper, the fabricated white OLED contains a 452-nm blue emitting layer(thickness of 30 nm) with 1 wt% LOFX doped in CBP(4,4'-bis(carbazol-9-yl)biphenyl) host and a584-nm orange emitting layer(thickness of 10 nm) with 0.8 wt% DCJTB(4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran) doped in CBP, which are separated by a 20-nm-thick buffer layer of TPBi(2,2',2'-(benzene-1,3,5-triyl)-tri(1-phenyl-1H-benzimidazole). A high color rendering index(CRI) of 84.5 and CIE chromaticity coordinates of(0.33, 0.32), which is close to ideal white emission CIE(0.333, 0.333), are obtained at a bias voltage of 14 V. Taking into account that LOFX is less expensive and the synthesis and purification technologies of LOFX are mature, these results indicate that blue fluorescence emitting LOFX is useful for applications to white OLEDs although the maximum current efficiency and luminance are not high. The present paper is expected to become a milestone to using medical drug materials for OLEDs. | 苗艳勤 高志翔 张爱琴 李源浩 王华 贾虎生 刘旭光 Tsuboi Taiju | 2015 | Chinese Physics B2015，24，5： | 1 |
| 5 | Emission spectroscopic characterization of F-2colour centres in a LiF crystal 显示文摘 | AlfonsP OliverL Taiju T | 2002 | OpticsCommunications2002，，214： | 1 |
| 6 | Alterations of structure and hydrolase activity of parkinsonism-associated human ubiquitin carboxyl-terminal hydrolase L1 variants显示文摘 | Kaori Nishikawa Hang Li Ryoichi Kawamura Hitoshi Osaka Yu-Lai Wang Yoko Hara Takatsugu Hirokawa Yoshimasa Manago Taiju Amano Mami Noda Shunsuke Aoki Keiji Wada | 2003 | Biochemical and Biophysical Research Communications2003，，1： | 1 |
| 7 | Adrenal Metastasis from Rectal Cancer: Report of a Case显示文摘 | Saburo Murakami Masahiro Terakado Taiju Hashimoto Yoshitaka Tsuji Katsuhiko Okubo Renzo Hirayama | 2003 | Surgery Today2003，，2： | 1 |
| 8 | Frequency Control of Mos-FET Fullbridge Power Inverter for Maximizing Output Power to Megasonic Transducer at 3 MHz显示文摘 | SUZUKI Taiju | 1998 | IEEE1998，，1： | 1 |
| 9 | Energy-transfer upconversion of rare earth ions in ionic crystals: Case of Tm 3+ /Ho 3+ -codoped LiYF 4 crystals显示文摘 | Taiju Tsuboi Hideyuki Murayama | 2005 | Journal of Alloys and Compounds2005，，： | 1 |
| 10 | Sivelestat sodium hydrate reduces radiation-induced lung injury in miceby inhibiting neutrophil elastase显示文摘 | Nobuhiko Yoshikawa Taisuke Inomata Yoshikatsu Okada Taiju Shimbo Masatsugu Takahashi Kazuhiko Akita Yasuo Uesugi Yoshifumi Narumi | 2013 | Molecular Medicine Reports2013，，4： | 1 |
| 11 | The new red - e- mitting phosphor of oxyfluoride Ca2RF4PO4: Eu^3+ (R = Gd, Y) for solid state lighting applications 显示文摘 | Yanlin H Yosuke N Taiju T | 2011 | Optics Express2011，19，7： | 1 |
| 12 | The thermal stabilities of luminescence and microstructures of Eu2+-doped KBaPO4 and NaSrPO4 with β-K2SO4 type structure显示文摘 | ZHANG Su-yin Yosuke Nakai Taiju Tsuboi | 2011 | Inorganic Chemistry2011，50，： | 1 |
| 13 | Emission spectroscope characterization of color centers in a LiF crystal显示文摘 | Alfons P Oliver L Taiju T | 2002 | Optical Communications2002，214，16： | 1 |
| 14 | Picosecond laser saturable absorption studies on color centers in LiF crystal显示文摘 | Oliver L Alfons P Taiju T | 2002 | Optical Communications2002，206，46： | 1 |
| 15 | Modeling and computer simulation of the electrooptic response of polymer- stabilized ferroelectric liquid crystal cell显示文摘 | TAKAHASHI TAIJU UMED TAKESHI | 1999 | Japanese Journal of Applied Physics1999，38，10： | 1 |
| 16 | Emissions pectroscopic characterization of F-2 colour centres in a LiF crystal 显示文摘 | Alfons P Oliver L Taiju T | 2002 | Optics Communications2002，214，： | 1 |
| 17 | Optical-transition Probability of Tm^(3+) Ions in Tm^(3+)/Er^(3+):YVO_4 Crystal显示文摘The polarized absorption spectra of Tm3+/Er3+:YVO4 crystal were measured at room temperature. Based on the Judd-Ofelt theory, the spectral parameters were obtained: the intensity parameters Wl of Tm3+ in Tm/Er:YVO4 crystal: W2 = 10.69×10-20, W4 = 0.604×10-20, W6 = 2.05×10-20 cm2 for the (100) face and W2 = 10.43×10-20, W4 = 0.13×10-20, W6 = 1.83×10-20 cm2 for the (001) face. Based on these values, the oscillator strength, radioactive lifetime and fluorescence branch ratio were calculated for Tm3+ in Tm/Er:YVO4 crystal. | 张莉珍 王国富 Taiju Tsuboi | 2004 | Chinese Journal of Structural Chemistry2004，23，4： | 1 |
| 18 | Low temperature luminescence of Tm3+ions in LiYF4 crystal显示文摘 | TSUBOI Taiju MURAYAMA Hideyuki SHIMAMURA Kiyoshi | 2006 | J Alloys Compd2006，，： | 1 |
| 19 | Optical constants of platinum octaethyl porphyrin in single-layer organic light emitting diode studied by spectroscopic ellipsometry显示文摘 | Taiju Tsuboi Yoko Wasai Nataliya Nabatova-Gabain | 2006 | Thin Solid Films2006，496，2： | 1 |
| 20 | Stratigraphic Correlation And Division of the Salite Strata显示文摘1 Introduction Stratigraphic correlation is the most important basic work in oil and gas exploration and development,Scientific and reasonable stratigraphic correlation is the premise of developing fine reservoir description,and it | WANG Hao YIN Taiju WANG Shu | 2017 | Acta Geologica Sinica(English Edition)2017，91，S1： | 1 |
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