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Showing 1-25 of 5,437 resultsfor "Index Terms":Organic Light-emitting Diodes
"Index Terms":Organic Light-emitting Diodes
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Innovative LED Lighting
2019 International Conference on Creative Business for Smart and Sustainable Growth (CREBUS)
Year: 2019 | Conference Paper |
Cited by: Papers (3)
The main innovative technologies and the principle of operation of OLED, FOLED, PHOLED, TOLED, QLED and RGB diodes are examined in this work. Luminous efficiency and the operating time dependencies on the working temperature of the diode are presented. The highly efficient light sources presented are also considered from the point of view of their energy use: for their production, use and subseque...Show More
A Solution-Processed Organic Thin-Film Transistor Backplane for Flexible Multiphoton Emission Organic Light-Emitting Diode Displays
Makoto Mizukami;Shinya Oku;Seung-Il Cho;Masahiro Tatetsu;Miho Abiko;Masashi Mamada;Tomo Sakanoue;Yoshiyuki Suzuri;Junji Kido;Shizuo Tokito
IEEE Electron Device Letters
Cited by: Papers (59)
An active matrix backplane based on solution-processed organic thin-film transistors (OTFTs) has been developed for flexible displays having multiphoton organic light-emitting diodes (OLEDs). The OTFT device has a bottom-gate/bottom-contact type structure consisting of a polyethylene naphthalate-based flexible substrate covered with patterned gate electrodes and a gate dielectric of UV-cured cardo...Show More
External Compensation of Nonuniform Electrical Characteristics of Thin-Film Transistors and Degradation of OLED Devices in AMOLED Displays
The variation of electrical characteristics of polycrystalline-silicon thin-film transistor (TFT) and degradation of organic light-emitting-diode (OLED) device cause nonuniform intensity of luminance and image sticking in active-matrix OLED (AMOLED) displays. An external compensation method that senses and compensates variations of threshold voltage and mobility of TFTs and degradation of OLED dev...Show More
Comparison of Pentacene and Amorphous Silicon AMOLED Display Driver Circuits
Vaibhav Vaidya;Susan Soggs;Jungbae Kim;Andreas Haldi;Joshua N. Haddock;Bernard Kippelen;Denise M. Wilson
Organic light-emitting diode (OLED) displays offer distinct advantages over liquid crystal displays for portable electronics applications, including light weight, high brightness, low power consumption, wide viewing angle, and low processing costs. They also are attractive candidates for highly flexible substrates. In active-matrix OLED (AMOLED) displays, a small transistor circuit is used to driv...Show More
Energy Loss Mechanism in Organic and Inorganic Light-Emitting Diodes
IEEE Photonics Technology Letters
Cited by: Papers (4)
We report that there exists a similar energy loss mechanism in fluorescent/phosphorescent organic light-emitting diodes (F/P OLEDs) and inorganic semiconductor optoelectronic devices [1310-nm InGaAsP-InP superluminescent diodes (SLDs)]. The loss of energy in inorganic SLDs based on thickness-altered asymmetric multiple quantum-well (QW) structures occurs depending sensitively on the sequence of QW...Show More
Flexible Organic Light-Emitting Diode Displays Driven by Inkjet-Printed High-Mobility Organic Thin-Film Transistors
Makoto Mizukami;Seung-Il Cho;Kaori Watanabe;Miho Abiko;Yoshiyuki Suzuri;Shizuo Tokito;Junji Kido
IEEE Electron Device Letters
Cited by: Papers (104)
A 3.2-in flexible color display, with a resolution of 50 ppi and composed of bottom-emission multiphoton organic light-emitting diodes (OLEDs) and inkjet-printed organic thin-film transistors (OTFTs) with a bottom-gate/bottom-contact structure on a color filter, was developed. The device could successfully display color videos while being bent, and achieved a maximum luminance of 125 cd/m2 with wh...Show More
Fully Flexible Organic LED Fabricated by a Solution-based Process
Seyedfakhreddin Nabavi;Yiwen Chen;Nathaniel Lasry;Sharmistha Bhadra
2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)
Year: 2022 | Conference Paper |
Cited by: Papers (3)
The current state of the art in organic light-emitting diodes (OLEDs) depends on the use of glass as a substrate and hence, suffer from mechanical brittleness and lack of flexibility. In this paper, a fully flexible OLED fabricated on the highly flexible substrate, namely polyethylene terephthalate (PET), using a solution-based process is proposed. In this regard, the organic materials, i.e., PEDO...Show More
High-Color-Purity Microfluidic Quantum Dots Light-Emitting Diodes Using the Electroluminescence of the Liquid Organic Semiconductor Backlight
Masahiro Kawamura;Hiroyuki Kuwae;Takumi Kamibayashi;Juro Oshima;Takashi Kasahara;Shuichi Shoji;Jun Mizuno
2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)
Year: 2019 | Conference Paper |
Cited by: Papers (4)
We proposed microfluidic quantum dots light-emitting diodes using a liquid organic semiconductor (LOS) and quantum dots (QDs) solutions. LOS and QDs solutions were used as a backlight and a luminophore, respectively. Channels for the QDs solutions were stacked on the LOS backlight. With applying voltage, red photoluminescence (PL) emissions of the QDs solution excited by the LOS backlight, was obs...Show More
Efficient Green Organic Light-Emitting Diodes by Plasmonic Silver Nanoparticles
Jeong Bin Shin;Se-Woong Baek;Seong Min Lee;Myeongcheol Kim;Jung-Yong Lee;Kyung Cheol Choi
IEEE Photonics Technology Letters
Cited by: Papers (13)
The resonance effect between the localized surface plasmon mode and the excited excitons in organic materials can enhance the optical and electrical performances of organic light-emitting diodes (OLEDs). Here, we show an enhancement in the luminescence efficiency of a green OLED by employing silver nanoparticles without an optical microcavity effect. The enhanced photoluminescence and exciton deca...Show More
Thermal and Nonthermal Factors Affecting the Lifetime of Blue Phosphorescent Organic Light-Emitting Diodes
Blue organic light-emitting diodes (OLEDs) with an emissive layer comprising 4-15 wt% FIrpic doped in bis(9-carbazolyl)benzene (mCP) were subjected to current stressing at 10-100 mA/cm2. The tests were conducted in either a continuous wave or pulsed mode to differentiate the thermal and nonthermal effects. The aged OLEDs exhibited a recombination zone shift toward the indium-tin-oxide anode, as ma...Show More
Flexible AM OLED panel driven by bottom-contact OTFTs
M. Mizukami;N. Hirohata;T. Iseki;K. Ohtawara;T. Tada;S. Yagyu;T. Abe;T. Suzuki;Y. Fujisaki;Y. Inoue;S. Tokito;T. Kurita
Active matrix organic-light-emitting-diode (AM OLED) panels, driven by organic thin-film transistors (OTFT), have been successfully fabricated on a flexible plastic substrate. The pixel circuit consists of two bottom-contact pentacene OTFTs working as switching and driving transistors. The panel has 16 /spl times/ 16 pixels, each of which have an OLED using a phosphorescent material with an emissi...Show More
Fabrication of a Blue $M\times N$ Pixel Organic Light-Emitting Diode Video Display Incorporating a Thermally Stable Emitter
Andreas Haldi;Jung B. Kim;Benoit Domercq;Abhishek P. Kulkarni;Stephen Barlow;Angela P. Gifford;Samson A. Jenekhe;Seth R. Marder;Bernard Kippelen
Journal of Display Technology
Cited by: Papers (5)
A 7 times 11 pixel blue OLED display was fabricated using a patterned indium-tin-oxide (ITO) substrate. The fabrication process for an M times N pixel organic light-emitting diode (OLED) video display including an electrical insulating layer and a physical pixel separator layer is presented. An efficient and thermally stable blue fluorescent organic material, 6,6'-bis((2-p -biphenyl)-4-phenylquino...Show More
Observation of Shot Noise in Phosphorescent Organic Light-Emitting Diodes
Thaddee Kamdem Djidjou;Dieter Alexander Bevans;Sergey Li;Andrey Rogachev
We employed a cross correlation method to study current noise in phosphorescent organic light-emitting diodes. The noise spectra revealed two frequency-dependent components. The first component displays \({1/f}^{1.3}\) dependence and correlates with the light emission of the devices. The second component is dominant in low-bias regime and varies as \({1/f}^{2.8}\) . It is attributed to inhomogenei...Show More
A novel voltage driving method using three thin-film transistors (TFTs) for active-matrix organic light-emitting diodes (OLEDs) is presented and verified by automatic integrated circuit modeling SPICE simulation. The proposed novel 3-TFT pixel circuit, which successfully compensates for the threshold voltage variations, uses few TFTs with simplified control signals, and the current nonuniformity o...Show More
Stable Blue Fluorescent Organic Light-Emitting Diodes Based on an Inorganically Doped Homojunction
MoO3 and Ca were incorporated in ambipolar 4, $4'$ -N, N'-dicarbazolylbiphenyl (CBP) by coevaporation as stable inorganic acceptors and donors, respectively. Both charge transport and injection in CBP single-carrier devices were markedly improved as the doping concentration was raised above 10 wt% for MoO3 and 6 wt% for Ca. P-i-n homojunction blue fluorescent organic light-emitting diodes (OLEDs) ...Show More
This study presents a novel voltage-modulated pixel circuit for active-matrix organic light-emitting diode (AMOLED) consisting of five n-type thin-film transistors (TFTs), one additional control signal, and one storage capacitor. The proposed circuit, which can be implemented in all-n-type and all-p-type low temperature poly-silicon (LTPS) TFT technologies, successfully compensates for threshold v...Show More
Embryonic development of fully biocompatible organic light-emitting diodes
2021 IEEE 21st International Conference on Nanotechnology (NANO)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
Prototype fully biocompatible organic light-emitting diodes are investigated, with a view to creating a suitable and high-performance light source as a medical implant device. A selection of organic LED materials that have potential suitability for the biological environment are examined. First, the biocompatibility of selected OLED materials was evaluated by the study of cell adhesion and cytotox...Show More
Design, Simulation & Optimization on Electrical and Optical Parameters of Alq3 QW-OLED
2022 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications (CoBCom)
Year: 2022 | Conference Paper |
Although the light-emitting diode (LED) was discovered in the 1900s, it is now widely used in lighting, screens, and a variety of other indoor and outdoor applications. (Organic Light Emitting Diode) OLED is one of the advancing branches of LED technology. In the structure of Alq3 OLEDs, highlight-efficiency optical materials such as TPD (hole transport layer) and Alq3 (electron transport layer) h...Show More
Towards Solution-Processed Top-Emitting OLEDs Using a Phosphorescent Iridium Complex
2019 21st International Conference on Transparent Optical Networks (ICTON)
Year: 2019 | Conference Paper |
Phosphorescent inverted top-emitting OLEDs using green iridium complexes have been fabricated by spin coating and their performances compared to bottom-emitting OLEDs based on the same materials. Even if the current efficiency is lower, respectively 7.0 ± 1.1 cd.A-1 and 12.9 ± 1.9 cd.A-1, this paper demonstrates the feasibility to fabricate phosphorescent top-emitting OLEDs by using a solution pro...Show More
Frontier of organic light emitting devices
Chihaya Adachi;Toshinori Matsushima;Hajime Nakanotani;Tomo Sakanoue;Masayuki Yahiro;Daisuke Yokoyama
2007 International Workshop on Physics of Semiconductor Devices
Year: 2007 | Conference Paper |
We report recent progresses on organic light emitting devices such as organic light emitting diode (OLED), light-emitting organic field effect transistor (LE-OFET) and organic laser diode (OLD). We demonstrate very low driving voltage of OLEDs using a p-i-n structure which also provides high current carrier injection over kA/cm2. Further we demonstrate novel organic devices such as light emitting ...Show More
Pentacene TFT driven AM OLED displays
Lisong Zhou;Sungkyu Park;Bo Bai;Jie Sun;Sheng-Chu Wu;T.N. Jackson;S. Nelson;D. Freeman;Yongtaek Hong
Pentacene organic thin-film transistors (TFTs)-driven active matrix organic light-emitting diode (OLED) displays has been investigated. This letter addresses several process issues unique to this type of display which are important in achieving bright and uniform displays. A bottom contact structure was used to fabricate the pentacene TFT backplane. Polyvinyl alcohol and parylene were used to isol...Show More
Developing New OLED Materials and Applications
Simonas Krotkus;Amlan K. Pal;Eli Zysman-Colman;Ifor D.W. Samuel
2020 IEEE Photonics Conference (IPC)
Year: 2020 | Conference Paper |
The development of deep blue OLED materials is a challenging problem – both for phosphorescent and TADF materials. We show that Ir(III) complexes with N-heterocyclic carbene ligands provide a route to deep blue OLED materials with CIE co-ordinates (0.15, 0.05) and external quantum efficiency above 12% at 100 Cd/m2.Show More
Ternary blend hostes for solution processed green phosphorescent organic light-emitting diodes
2021 19th International Conference on Optical Communications and Networks (ICOCN)
Year: 2021 | Conference Paper |
In this paper a series of solution processed green phosphorescent organic light-emitting diodes (PhOLEDs) based on blend hosts-guest configuration have been fabricated and the effect of various hole transport materials, e.g. 1,3-Di-9- carbazolylbenzene (mCP), poly(9-vinylcarbazole) (PVK) and 4,4′,4″-tris(N-carbazolyl)-triphenylamine (TCTA) and their combination as the hosts on the performance of P...Show More
A Driving Scheme for Active-Matrix Organic Light-Emitting Diode Displays Based on Current Feedback
Journal of Display Technology
Cited by: Papers (29)
This paper presents a method of driving active-matrix organic light-emitting diode (AMOLED) displays with amorphous silicon (a-Si) thin-film transistors (TFTs). By using current feedback, the method effectively compensates for the effect of shift in the threshold voltage (V T) of a-Si TFTs on the OLED current. A CMOS transresistance amplifier is used as the column driver to cancel the effect of la...Show More
LTPS TFT Process on Polyimide Substrate for Flexible AMOLED
Journal of Display Technology
Cited by: Papers (120)
For conventional active-matrix organic light-emitting diode (AMOLED) flat panel displays, low temperature poly-silicon thin-film transistor (LTPS TFT) on rigid glass substrate process has already been well established. However, this technology cannot be applied directly on polyimide (PI) substrate for flexible display. This is because PI has the different coefficient of thermal expansion (CTE) fro...Show More
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