Browsing by Author "Lee, Meng-Ting"

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Highly efficient and stable sky blue organic light-emitting devices
(2006-09-18)
Lin, Mei-Fang
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Wang, Lei
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Wong, Wai-Kwok
;
Cheah, Kwok-Wai
;
Tam, Hoi-Lam
A highly efficient and stable sky blue organic light-emitting device doped with a sky blue dopant BUBD-1 has been fabricated, achieving an electroluminescence efficiency of 13.2 cd/A and 6.1 lm/W at 20 mA/cm(2) and 6.7 V, with Commission Internationale del'Eclairage coordinates of (0.16, 0.30) and a half-decay lifetime of 1815 h at an initial brightness of 2640 cd/m(2). This performance is one of the best blue devices ever reported without using hole blocking layer or any p or n dopant in hole or electron transport layer. (c) 2006 American Institute of Physics.
Highly efficient and stable white light organic light-emitting devices
(2007-08-13)
Lin, Mei-Fang
;
Wang, Lei
;
Wong, Wai-Kwok
;
Cheah, Kok-Wai
;
Tam, Hoi-Lam
A highly efficient two-element white light organic light-emitting device with a sky blue dopant BUBD-1 and a yellow dopant TBRb was fabricated. The device achieved an electroluminescence efficiency of 17.1 cd/A and 7.9 lm/W at 20 mA/cm(2). From 112 to 32 010 nits, the CIEx,y coordinates variation was Delta(x,y)<+/-(0.01,0.01), which is superior to common white light organic light-emitting devices (OLEDs) that tend to change color with drive conditions. Moreover, the device reached a half-decay t(1/2) lifetime over 40 000 h at an initial luminance of 300 cd/m(2). This result is among the best records of fluorescent white light OLEDs. (C) 2007 American Institute of Physics.
Highly efficient blue organic electroluminescent devices
(2005)
Chang, Chia-Ming
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Lee, Meng-Ting
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Chen, Chin H.
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應用化學系
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Department of Applied Chemistry
We have synthesized a highly efficient blue dopant based on the amino-substituted distyrylarylene (DSA-amine) fluorescent dye. Doped in the stable diphenyanthracene type of blue host material 2-(methyl)-9,10-di(2-naphthyl)anthrace (MADN), it achieved a luminance yield of 9.1 cd/A at 20 mA/cm(2) with a CIEx,y color coordinate of [0.16, 0.28] and a maximum external quantum efficiency of 4.7%.
Highly efficient blue organic light-emitting devices incorporating a composite hole transport layer
(2005-01-01)
Liao, Chi-Hung
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Lee, Meng-Ting
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Chen, Chin H.
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應用化學系
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Department of Applied Chemistry
Organic light-emitting devices (OLEDs) incorporating the copper phthalocyanine (CuPc)/N,N'-bis-(1-naphthyl)-N,N'-diphenyl, 1,1'-biphenyl-4,4'-diamine (NPB) composite hole transport layer (c-HTL) have been fabricated. Under optimal condition, the amino-subsituted distyrlarylene fluorescent dye (DSA-Ph), doped in the stabel diarylanthracene blue host (MADN) achieved a luminance efficiency of 16.2 cd/A with a CIEx,y color coordinate of [0.15, 0.29] at 6.44 V (20 mA/cm(2)), which is one of the best ever reported to date.
Highly efficient deep blue organic electroluminescent device based on 1-methyl-9,10-di(1-naphthyl)anthracene
(2006-12-18)
Ho, Meng-Huan
;
Wu, Yao-Shan
;
Wen, Shih-Wen
;
Lee, Meng-Ting
;
Chen, Teng-Ming
The author have developed 2-methyl-9,10-di(1-naphthyl)anthracene (alpha,alpha-MADN) as an effective wide band gap host material for Forster energy transfer to the unsymmetrical mono(styryl)amine deep blue fluorescent dopant (BD-1). This guest/host emitting system, at the optimal doping concentration of 3%, can also increase the probability of carrier recombination near the hole-transport/emitting layer interface for the blue organic light emitting device which produces electroluminescence efficiencies of 3.3 cd/A and 1.3 lm/W and a deep blue CIEx,y color coordinates of (0.15, 0.13) that are 50% better than those of the traditional beta,beta-isomeric host (MADN) with the same dopant. (c) 2006 American Institute of Physics.
Highly efficient white light organic light-emitting device
(2007-01-01)
Lin, Mei-Fang
;
Wang, Lei
;
Wong, Wai-Kwok
;
Cheah, Kok-Wai
;
Tam, Hoi-Lam
A highly efficient white organic light-emitting device (OLED) with a novel sky blue dopant BUBD-1 in a two-color emission system was fabricated. The device achieved an EL efficiency of 17.1 cd/A and 7.9 lm/W at 20 mA/cm 2 with CIEx,y coordinates of (x=0.29, y=0.41) which was not changed with drive conditions. The white light OLED reached a half-decay t(1/2) lifetime over 40,000 hours at an initial luminance of 300 cd/m(2).
Improved stability of C-545T doped green OLEDs
(2005)
Lee, Meng-Ting
;
Liao, Chi-Hung
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Tsai, Chih-Hung
;
Chen, Chin-H.
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應用化學系
The stability of C-545T doped green organic electroluminescent device (OLED) has been improved by doping styrylamine derivate, p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-Ph) benzene (DSA-Ph) in hole transporting layer, the device configuration abbreviated as BHTL. Compared with the undoped device, the stability of the BHTL device has increased by a factor of 1.3 without affecting the electroluminescence (EL) efficiency of 11 cd/A and color (CIEx,y = 035, 0.61). The enhanced stability is believed to derive from the hole trapping nature of DSA-Ph which can reduce the residual hole carriers in tris(8-hydroquinolinato)aluminum (Alq(3)) and suppress the formation of florescent quencher of Alq(3) cationic species.
Improving the performance of blue phosphorescent organic light-emitting devices using a composite emitter
(2009-09-01)
Chu, Miao-Tsai
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Lee, Meng-Ting
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Chen, Chin H.
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Tseng, Mei-Rurng
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平面顯示技術碩士學位學程
A composite emitter is constructed by doping a carrier-transporting material into a conventional emitter composing of only host and dopant. The transport of carriers from either hole- or electron-transporting layer into the emitter can be promoted through the carrier-transporting material, in particular, when a wide-band-gap host material is used. A blue phosphorescent OLED based on iridium(III)bis((4,6-difluorophenyl)-pyridinate-N,C(2)')-pico-linate (FIrpic) as dopant in the composite emitter achieved a power efficiency of 20 lm/W and a low driving voltage of 4.2 V at 1000 cd/m(2), whose current efficiency at 20 mA/cm(2) was 2.5 times better than that of device using the conventional emitter. (C) 2009 Elsevier B.V. All rights reserved.
Novel silane-based blue dopant for organic electroluminescent devices
(2005)
Yeh, Chih-Ming
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Lee, Meng-Ting
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Liao, Chi-Hung
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Chen, Chin H.
;
應用化學系
We have synthesized a new deep blue dopant (JTI) based on organic Silane fluorescent dye. Owing to the steric hindered characteristic of Silane moiety, the problem of dopant concentration quenching can be suppressed. When JTI was doped up to 15% in the stable blue host material 2-JTI JTI was doped up to 15% in the stable blue host material 2-methyl -9,10-di(2-naphthyl a luminance yield of 3.93 cd/A at 20 mA/cm(2) with a near saturated CIEx,y color coordinate of [0.15, 0.15].
Recent Development of Blue Fluorescent OLED Materials and Devices
(2005-09-01)
Wen, Shih-Wen
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Lee, Meng-Ting
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Chen, Chin H.
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應用化學系
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友訊交大聯合研發中心
Highlights of the recent development of highly efficient and robust blue fluorescent organic light-emitting device (OLED) materials and devices are reviewed with emphasis on work accomplished at the OLED Laboratory of Display Institute, National Chiao Tung University, Hsinchu, Taiwan, R.O.C.