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Light emitting devices

Xem 1-20 trên 33 kết quả Light emitting devices
  • Light emitting properties of poly[4-(5-(biphenyl- 4-yl)-4-hexylthiophen-2-yl)-2-dodecyl-7-(4-hexyl-thiophen2-yl)-2H-benzo[d][1,2,3]-triazole] (PPhHTBT) and poly(9-vinylcarbazole) (PVK) blends were investigated with a configuration of ITO/PEDOT-PSS/BLEND/Ca/Al in ratios ranging from 5 to 100 wt% in PPhHTBT. Thin film and solution spectra of all blends revealed that energy transfer was completely achieved. Device performance increased for all blends and reached 1.1 cd/A for 30 wt% PPhHTBT.

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  • A series of solution processable, wide band-gap host materials composed of carbazole and tetraphenylsilane groups were designed and synthesized. Their thermal, electrochemical, and photophysical properties were fully investigated. The introduction of bulky tetraphenylsilane and tert-butyl groups around the carbazole led to high glass transition temperatures (Tg) between 120 and 204◦C. The triplet energies (ET) of the synthesized materials were examined by low temperature (77 K) photoluminescence studies and determined as E T > 2.6 for all compounds.

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  • The average correlated color temperature analysis indicates that the Y2MoO6:Pr3þ NPs can be useful for use in warm light sources. The Y2MoO6: Pr3þ (5 mol%) NPs were used for the design of anti-counterfeiting ink in security applications. The tunable properties of the prepared Y2MoO6:Pr3þ NPs make them suitable for multifunctional applications.

    pdf11p meyerowitz 25-12-2021 9 0   Download

  • In this chapter, you will learn about: Zener diodes; Opto-Electronic Diodes: Light Emitting Diodes (LEDs), laser diodes, photodiodes, solar cells, varactor diodes.

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  • Two-dimensional (2D) perovskites are a new class of functional materials that may find applications in various technologically important areas. Due to the better moisture and illumination stability, layered perovskites can be the next generation of materials for solar light-harvesting applications, as well as for light emitting diodes (LEDs).

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  • Here in this paper we prepared Eu3þ doped SrAl2O4 phosphors with various concentrations of Eu3þ (1e5 mol) by a green combustion technique. The phase structure and purity of all prepared nanopowders (NPs) were studied by X-ray diffraction analysis. The prepared NPs showed a fibre-like morphology which is confirmed by scanning electron microscopy results.

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  • Capability of exciplex energy transfer through a spacer was investigated using three exciplex-forming solid mixtures which contained the well-known electron accepting 2,4,6-tris[3-(diphenylphosphinyl)phe nyl]-1,3,5-triazine and appropriately designed bipolar cyanocarbazolyl-based derivatives functionalized by attachment of carbazolyl, acridanyl or phenyl units. These novel cyanocarbazolyl-based derivatives were used as both the spacer and exciplex-forming donor.

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  • In particular, when HPCOBLED is of high power, the decrease of luminous flux is larger. An explanation for this result is consumed power on the LED. We proposed HPCOBLED model modified from Hodapp’s model using temperature gradient between p-n junction of device and heat radiator for description of the temperature effect on luminous flux of HPCOBLED. The calculation results for the modified HPCOBLED model match with those experimental values measured by the luminous flux measurement system (VMI-PR-001, Vietnam).

    pdf7p thuyliebe 09-10-2018 53 0   Download

  • Optoelectronics - Advanced Materials and Devices is a second edition following the initial Optoelectronics - Materials and Techniques book published in 2011 as part of the InTech collection of international works on optoelectronics. Optoelectronics, as the discipline devoted to the study and application of electronic devices that emit, detect, and otherwise control light, has widely proliferated globally and enabled many of today's modern conveniences.

    pdf494p phoebe75 19-02-2013 86 22   Download

  • After the ground breaking discovery of electrical charge carrier transport in polymers in the late 1980s by Alan J. Heeger, Alan G. MacDiarmid and Hideki Shirakawa [1–3], who were awarded the Nobel Prize in chemistry in 2000, the question arose as to whether organic materials would also find applications as organic semiconductors. This field really started to attract major attention after the demonstration of the first organic light emitting device (OLED) in 1987 by Tang and Van Slyke [4].

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  • A laser, an acronym lor light amplification by stimulated emission of radiation, is a device for generating a high-intensity, ostensibly parallel beam of monochromatic (single wavelength) electromagnetic radiation. The possibility of stimulated emission was predicted by Einstein in I9I7; based on the work of Gordon in 1955 and Schawlow and Townes in 1958, Maiman created the first operational laser in 1960, a ruby laser emitting a brilliant red beam of light.

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  • Luminescence .is .the .spontaneous .emission .of .light .from .the .excited .electronic .states .of .physical .systems. The .emission .is .preceded .by .the .process .of .excitation, .which .may .be .produced .by .a .variety .of .agents. .If .it .is .achieved .by .the .absorption .of .light .it .is .called .photoluminescence, .if .by .the .action .of .an .electric .field .electroluminescence, .if .by .a .chemical .reaction .chemiluminescence, .and .so .on. Following .the .excitation, .if .the .system .is .left .alone .without .any .additional .influence .from .the .exciting .agent, .it .

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  • This book describes the state-of-the-art advancement in the field of organic electroluminescence contributed by many researchers with internationally established expertise in the field. It includes original contributions on the synthesis of suitable organic materials, fabrication of organic light emitting devices (OLEDs) and organic white light emitting devices (WOLEDs), characterization of these devices and some designs for optimal performance.

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  • Introduction 1 Ideal Diode 1 Semiconductor Materials 3 Energy Levels 6 Extrinsic Materials—n- and p-Type 7 Semiconductor Diode 10 Resistance Levels 17 Diode Equivalent Circuits 24 Diode Specification Sheets 27 Transition and Diffusion Capacitance 31 Reverse Recovery Time 32 Semiconductor Diode Notation 32 Diode Testing 33 Zener Diodes 35 Light-Emitting Diodes (LEDs) 38 Diode Arrays—Integrated Circuits 42 PSpice Windows 43

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  • Organic light emitting diodes (OLEDs) have attracted enormous attention in the recent years because of their potential for flat panel displays and solid state lighting. This potential lies in the amazing flexibility offered by the synthesis of new organic compounds and by low-cost fabrication techniques, making these devices very promising for the market.

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  • Organic light-emitting diodes (OLED) are playing a major role in information technology (IT) by providing the promise of further expanding the use of digital displays through making display fabrication technology lower in cost and higher in performance to replace liquid crystal displays (LCD). Due to various attractive features such as high contrast, high brightness, large color gamut and thin structure, various sized OLED displays from small-sized mobile phone display to large-sized TV display have already begun to be mass-produced....

    pdf0p ktcn_1 10-07-2012 93 11   Download

  • Free-standing semiconductor nanowires have been used to fabricate nanometer-scale field-effect transistors (FETs), bipolar junction transistors, and light- emitting diodes, nano-scale lasers, complementary inverters, complex logic gates, gas sensors, nano-resonators, nano-generators and nano-photovoltaic devices. Since the very first pioneering works carried out by K. Hiruma in Japan in the mid 90’s, and by C.M.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Electroluminescent Characteristics of DBPPV–ZnO Nanocomposite Polymer Light Emitting Devices

    pdf6p sting09 21-02-2012 38 2   Download

  • Tham khảo tài liệu 'organic light emitting diode material process and devices part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf7p 239198717 12-01-2012 35 5   Download

  • Tham khảo tài liệu 'organic light emitting diode material process and devices part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf25p 239198717 12-01-2012 53 5   Download

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