Dongguan LITEWELL OLED Technology Incorporation

Dongguan, China

Dongguan LITEWELL OLED Technology Incorporation

Dongguan, China

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Tao S.,University of Electronic Science and Technology of China | Tao S.,Soochow University of China | Tao S.,City University of Hong Kong | Lai S.L.,University of Hong Kong | And 6 more authors.
Organic Electronics: physics, materials, applications | Year: 2011

Highly efficient blue phosphorescent organic light-emitting devices have been achieved by using a new emitter Iridium complex, bis[(3,4,5- trifluorophenyl)-pyridinato-N,C 2′] picolinate (F 3Irpic). For a mCP:4%F 3Irpic device, blue emission with a maximum power efficiency of 18.1 lm/W has been realized, which is much higher than those of FIrpic based devices. The emission peak was located at 480 nm with a subpeak at 511 nm. By using an optimized device structure with a better host material, performance of the device can be further increased to give a maximum power efficiency of 33.7 lm/W. © 2011 Elsevier B.V. All rights reserved.


Lai S.-L.,City University of Hong Kong | Tao S.-L.,University of Electronic Science and Technology of China | Chan M.-Y.,University of Hong Kong | Lo M.-F.,City University of Hong Kong | And 4 more authors.
Journal of Materials Chemistry | Year: 2011

We report the synthesis of a new biscyclometalated yellow phosphorescent dopant iridium(iii) bis[2-(2-naphthyl)pyridine](acetylacetonate) (Ir(npy) 2acac) and studies of its application in organic light-emitting devices (OLEDs), in which highly efficient yellow-emitting OLEDs with high peak forward viewing efficiencies of 34 cd A-1, 22 lm W-1, and 11% can be obtained, along with the Commission de L'Eclairage 1931 chromaticity coordinates of (0.45, 0.54). More importantly, yellow phosphorescence can be achieved without the formation of excimer emission. Particularly, such devices exhibit a very broad and featureless peak at ca. 550 nm with a wide full spectral width at half maximum (FWHM) of 87 nm. Furthermore, combination with iridium(iii) bis[(3,4,5,-trifluorophenyl)-pyridinato-N,C2′] picolinate doped p-bis-(triphenylsilyly)benzene as the blue-emitting layer yields highly efficient white OLEDs with maximum efficiencies as high as 46 cd A-1 and 41 lm W-1 in the forward direction, making Ir(npy)2acac a promising organic phosphor for applications in yellow and white OLEDs. © The Royal Society of Chemistry 2011.


Jiang Y.,University of Electronic Science and Technology of China | Tao S.,University of Electronic Science and Technology of China | Huang J.,University of Electronic Science and Technology of China | Zhou C.,University of Electronic Science and Technology of China | And 2 more authors.
Chemistry Letters | Year: 2012

A novel strategy for preparing large-area, vertically aligned silicon nanotip arrays at near-room temperature by combining a silver mirror reaction with metal-catalyzed electroless etching has been developed. It has been demonstrated that silicon nanotip arrays of lengths 4-7 μm and middle part diameters ranging from 100 to 300nm have been successfully fabricated on silicon wafers. Furthermore, the resultant large-area vertically aligned Si nanotip arrays on Si substrates are expected to be used in field-emission applications in the future and to have broad scope for development. Silicon nanotip films show very low reflectance (<10% at 300-800 nm) and strong broadband optical absorption (>90% at 500 nm). This transmission would be important for use as antireflection coatings on processed solar cells. These optical phenomena may lead to the realization of efficient solar cells based on Si nanostructures. © 2012 The Chemical Society of Japan.


Wu C.,University of Electronic Science and Technology of China | Wu C.,City University of Hong Kong | Tao S.,University of Electronic Science and Technology of China | Chen M.,University of Electronic Science and Technology of China | And 5 more authors.
Dyes and Pigments | Year: 2013

A new blue-emitting iridium complex, Iridium(III) bis [(2,3,4- trifluorophenyl) -pyridinato-N, C 2'] picolinate (Ir(tfpd) 2pic) has been designed, synthesized and used to fabricate blue phosphorescent organic light-emitting devices with a efficiency up to 41.4 lm/W (52.6 cd/A). Furthermore, by combining the blue phosphorescence of Ir(tfpd) 2pic and the yellow emission of iridium(III) bis [2-(2-naphthyl)- pyridine] (acetylacetonate) (Ir(npy) 2acac), highly efficient white emission with a maximum efficiency of 49.0 lm/W (54.5 cd/A) has been achieved. The results indicate that Ir(tfpd) 2pic is a promising blue phosphor for the applications in highly efficient blue and white OLEDs. © 2012 Elsevier Ltd. All rights reserved.


Wu C.,University of Electronic Science and Technology of China | Wu C.,City University of Hong Kong | Tao S.,University of Electronic Science and Technology of China | Chen M.,University of Electronic Science and Technology of China | And 6 more authors.
Chemistry - An Asian Journal | Year: 2013

In the deep red: A biscyclometalated deep-red phosphorescent dopant containing a new ancillary ligand, iridium(III) bis(1-phenylisoquinolinato-N, C2′) (2-(benzo[d]oxazol-2-yl)phenol) (Ir(piq)2bop) has been designed and synthesized. By doping the new complex into Bebq 2 (Bebq2=bis(10-hydroxybenzo[h] quinolinato)beryllium), a saturated red-emitting PHOLED device was obtained. At a luminescence of 100 cd m-2, the device shows efficiencies of 10.3 cd A-1 and 9.1 Lm W-1 with CIE coordinates of (0.67, 0.33). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wu C.,University of Electronic Science and Technology of China | Wu C.,City University of Hong Kong | Tao S.,University of Electronic Science and Technology of China | Chen M.,University of Electronic Science and Technology of China | And 6 more authors.
Dyes and Pigments | Year: 2013

A new multifunctional host material, 3,3′-(2,7-di(quinolin-8-yl)-9H- fluorene-9,9-diyl)bis(9-phenyl-9H-carbazole) has been designed, synthesized and used in high performance OLEDs. This tetrasubstituted fluorene was found to have good morphological and thermal stability with a high glass transition temperature of 192 °C and a decomposition temperature of 480 °C. A non-doped tri-layer blue fluorescent device based on this tetrasubstituted fluorene shows a deep blue emission with a Commission Internationale de L'Eclairage coordinates of (0.16, 0.10) and a maximum power efficiency of 1.1 lm/W. An orange phosphorescent device using this tetrasubstituted fluorene as a host in conjunction with an iridium complex as dopant exhibits a maximum power efficiency of 21.0 lm/W, which is much higher than that of a biscarbazolylbiphenyl-based control device (11.5 lm/W) with the same device structure. Furthermore, by using the tetrasubstituted fluorene as a blue florescent emitter and a host for phosphorescent dopant, a white emitting OLED with a maximum power efficiency of 22.5 lm/W and CIE coordinates of (0.38, 0.33) were obtained. These results show that this tetrasubstituted fluorene is a versatile multifunctional material for OLED applications. © 2013 Elsevier Ltd. All rights reserved.


Tao S.,University of Electronic Science and Technology of China | Tao S.,City University of Hong Kong | Jiang Y.,University of Electronic Science and Technology of China | Lai S.-L.,City University of Hong Kong | And 5 more authors.
Organic Electronics: physics, materials, applications | Year: 2011

A new multifunctional compound, 4,4′-di-(1-pyrenyl)-4′′- [2-(9,9′-dimethylfluorene)]-triphenylamine (DPFA) has been designed, synthesized and applied respectively as host-emitter, electron- and hole-transporters in organic light-emitting devices (OLEDs). The compound exhibits good thermal stability with a glass transition temperature (T g) of 161 °C and shows blue emissions in both solution and films. OLEDs with DPFA playing various roles have been fabricated and characterized. The results show that DPFA has efficient bipolar charge transport properties for both hole and electron. By using DPFA as a blue emitter in a typical three layer device with a configuration of ITO/NPB(50 nm)/DPFA(20 nm)/TPBI(30 nm)/LiF(0.5 nm)/MgAg, highly efficient blue emission with a maximum luminescence efficiency of 5.1 cd/A (5.3 lm/W) is obtained. © 2010 Elsevier B.V. All rights reserved.


Huang D.,CAS Technical Institute of Physics and Chemistry | Huang D.,University of Chinese Academy of Sciences | Ye J.,CAS Technical Institute of Physics and Chemistry | Ye J.,University of Chinese Academy of Sciences | And 8 more authors.
Yingxiang Kexue yu Guanghuaxue/Imaging Science and Photochemistry | Year: 2010

A new bipolar phosphorescence host material carbostyril derivative 3-(4-(9H-carbazol-9-yl) phenyl)-1-methyl-4-phenylquinolin-2(1H)-one was designed and synthesized. Through theoretical calculations we found that the HOMO and LUMO obitals respectively localed in carbazole group and carbostyril group, that imply this compound is a good bipolar material. The compound phosphorescence emission is 515 nm (2.41 eV), meet the basic requirement of green phosphorescence host material (> 2.40 eV). TGA and DSC results show the compound has high thermal stabilities, the decomposition temperature and glass transition temperature are 312°C and 105°C respectively. The results show that the new compound is a potential green phosphorescence host material with bipolar feature.


Zheng C.-J.,CAS Technical Institute of Physics and Chemistry | Zheng C.-J.,University of Chinese Academy of Sciences | Zhao W.-M.,Dongguan LITEWELL OLED Technology Incorporation | Wang Z.-Q.,CAS Technical Institute of Physics and Chemistry | And 8 more authors.
Journal of Materials Chemistry | Year: 2010

Three deep-blue-emitting anthracene derivatives, 2-tert-butyl-9,10-bis(9,9- dimethylfluorenyl) anthracene (TBMFA), 2-tert-butyl-9,10-bis[4-(2-naphthyl) phenyl] anthracene (TBDNPA), and 2-tert-butyl-9,10-bis[4-(9,9-dimethylfluorenyl) phenyl] anthracene (TBMFPA), with naphthalene or 9,9-dimethylfluorene side units, have been designed, synthesized, and characterized. The anthracene derivatives show strong deep-blue emission both in solution and in thin films. The three derivatives also have high glass-transition temperatures (T g ≥ 133 °C) due to the presence of sterically congested terminal groups. Organic light-emitting diodes (OLEDs) prepared using these anthracene derivatives as non-doped emitters exhibit bright and saturated deep-blue emissions. OLEDs based on TBDNPA give the best performance with a low turn-on voltage (3.0 V with a brightness of 1 cd m-2), and a high efficiency (5.17% external quantum efficiency at 8.4 mA cm-2). These results are among the best ever reported for saturated deep-blue OLEDs with a CIE coordinate of y < 0.10. © The Royal Society of Chemistry 2010.


Zheng C.-J.,CAS Technical Institute of Physics and Chemistry | Zheng C.-J.,University of Chinese Academy of Sciences | He J.,CAS Technical Institute of Physics and Chemistry | Zhao W.-M.,Dongguan Litewell OLED Technology Incorporation | And 5 more authors.
Yingxiang Kexue yu Guanghuaxue/Imaging Science and Photochemistry | Year: 2010

A new bipolar host material C1PBD, constituted by carbazole and oxadiazole groups, has been designed, synthesized and characterized. The optical and electrochemical properties of C1PBD prove this new bipolar host could be used as the blue fluorescence host. The OLED based on C1PBD and TBPe exhibited a low turn-on voltage (3.2 V with a brightness of 1 cd · m-2), a high efficiency (2.26 cd/A for the max current efficiency), and a stable blue emission with a CIE coordinate of (0.14, 0.14).

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