Browsing by Author "Iou, CY"

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4-(Dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran doped red emitters in organic light-emitting devices
(2003-09-22)
Liu, TH
;
Iou, CY
;
Wen, SW
;
Chen, CH
;
應用化學系
We have studied the device optimization of red 4-(Dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) dye doped Alq(3) emitters in organic light-emitting devices (OLED). By varying the hole injection materials, thickness of hole-transport layer and by evaporation with rubrene as co-dopant, efficiencies of 3.24 cd/A and near saturated CIE color coordinates of x = 0.643, y = 0.354 was achieved without needing additional doping of hole-trap with NPB. From experiments with film thickness variation, it is concluded that the improved electrofluorescent (EL) performance and color saturation are due to the synergistic effects of microcavity, device structural optimization as well as optimal doping of DCJTB with rubrene. We believe this luminance efficiency for red is by far one of the best ever reported for dye-doped electrofluorescent OLEDs. (C) 2003 Elsevier B.V. All rights reserved.
Development of highly stable organic electroluminescent devices with a doped co-host emitter system
(2005-03-01)
Liu, TH
;
Iou, CY
;
Chen, CH
;
光電工程學系
;
友訊交大聯合研發中心
Efficient red organic light-emitting devices based on the fluorescent dye "4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetra-methyljulolidyl-9-enyl)-4H-pyran (DCJTB) doped in co-host emitter (CHE) systems of rubrene/tris(8-hydroxyquinolinato)aluminum (Alq(3)) [60/40] and of 9, 1 0-di(2-naphthyl)anthracene (ADN)/Alq(3) [60/40] which achieved a luminance efficiency of 4.2-5.5 cd/A at 20 mA/cm(2) with Commission Internationale d'Eclairage coordinates of [0.64,0.35]-[0.62,0.37]. At high rubrene or ADN concentration (>60%), this DCJTB doped CHE system has the advantage of alleviating the current-induced fluorescence quenching problem often encountered in red organic electroluminescence (EL) devices and greatly improves the EL efficiency over a wide range of drive current conditions. (C) 2004 Elsevier B.V. All rights reserved.
Doped blue emitters of 9,10-di(2-naphthyl)anthracene in organic electroluminescent devices
(2003-04-04)
Liu, TH
;
Shen, WJ
;
Yen, CK
;
Iou, CY
;
Chen, HH
Blue EL emission of 9,10-di(2-naphthyl)anthracene (ADN) based emitter in OLED is highly dependent upon its thickness and attenuated by the microcavity effect of the emitter. By carefully tuning the thickness of ADN and optimizing the doping concentration of TBP, one of the highest efficiencies reported for the anthracene based blue emitter at 6.6 cd/A with a CIE of x = 0.13; y = 0.21 is achieved.
Doped red organic electroluminescent devices based on a cohost emitter system
(2003-12-22)
Liu, TH
;
Iou, CY
;
Chen, CH
;
應用化學系
;
光電工程學系
We have developed an efficient red emitter in organic light-emitting diodes based on the fluorescent dye 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetra-methyljulolidyl-9-enyl)-4H-pyran doped in a cohost emitter system of 5,6,11,12-tetraphenylnathacene/tris(8-hydroxyquinolinato)aluminum which achieved an electroluminescence (EL) efficiency of 4.4 cd/A and 2.1 lm/W at 20 mA/cm(2) and 6.8 V, with a near saturated Commission Internationale d'Eclairage coordinates (x=0.65, y=0.35). This cohost emitter system has the advantage of alleviating the current-induced fluorescence quenching often encountered in red organic EL devices and greatly improves the EL efficiency over a wide range of drive current conditions. From accelerated degradation tests, a device half-life of about 33 800 h can be projected in this system at an initial device luminance of 100 cd/m(2). (C) 2003 American Institute of Physics.