Hasil Pencarian  ::  Simpan CSV :: Kembali

"Organic Light Emitting Diode (OLED) merupakan LED dimana lapisan emissive nya terbuat dari bahan organik yang dapat memancarkan cahaya ketika dialiri arus listrik. Dalam skripsi ini, dirancang struktur green OLED dengan empat struktur yang berbeda yaitu single layer green OLED (GPE), HTL+GPE, GPE+ETL, dan HTL+GPE+ETL. Hasil simulasi menunjukkan bahwa penambahan electron transport layer dapat meningkatkan nilai luminansi secara signifikan. Penambahan HTL dan ETL dapat menurunkan operating voltage. Luminansi tertinggi yaitu 997.330 cd/m2 dicapai ketika tegangan 4V pada struktur ITO/HTL/GPE/ETL/LiF-Al. Warna yang dihasilkan dari keempat struktur tersebut adalah warna hijau dengan panjang gelombang 550 nm.

---

An OLED (Organic Light Emitting Diode) is a LED in which the emissive electroluminescent layer is a film of organic compounds which emit light in response to an electric current. This thesis presents a design green OLED structure with four different structures, single layer green OLED (GPE), HTL+GPE, GPE+ETL and HTL+GPE+ETL.

The simulation result shows that addition of electron transport layer will significantly improve the luminance. The addition of HTL and ETL can reduce the operating voltage. The highest luminance is 997.330 cd/m2 achieved when the voltage is 4V on the structure of ITO/HTL/GPE/ETL/LiF-Al. The color of all the structures is green with a wavelength of 550 nm."

"Labelisasi energi pada peralatan rumah tangga semakin dirasakan penting sebagai salah satu upaya untuk meningkatkan kesadaran masyarakat dalam melakukan penghematan energi, sehubungan dengan semakin tingginya harga energi listrik akhir-akhir ini. Saat ini lampu LED Light Emitting Diode telah banyak digunakan sebagai pengganti lampu konvensional sebelumnya, seperti lampu compact- fluorescent CFL dan lampu pijar, dan merupakan solusi dalam menghemat listrik, karena konsumsi energinya yang rendah. Namun demikian lampu LED termasuk jenis beban non linier yang dapat menimbulkan distorsi harmonik pada sistem tenaga listrik. Penggunaan lampu LED yang semakin meningkat dan terpasang dalam jumlah besar pada sistem tenaga listrik dapat meningkatkan distorsi harmonik yang cukup signifikan pada sistem tersebut.Sampai saat ini belum adanya aturan atau panduan teknis mengenai labelisasi dan pengelompokannya, maka penelitian ini bertujuan mengelompokkan lampu LED melalui pengukuran parameter tingkat efikasi dan kualitas daya, meliputi faktor daya PF dan harmonik THD-i yang dihasilkan dan dikelompokan berdasarkan efikasi dan kualitas daya. Sampel lampu LED yang diuji berjumlah 64 buah mulai dari daya pengenal 2 - 13 watt, mengikuti prosedur uji SNI IEC 62612:2016. Tanda pelabelan efisiensi energi 1 menggunakan tanda bintang berwarna kuning untuk peringkat efikasi.Tanda pelabelan efisiensi energi 2 menggunakan tanda bintang berwarna biru untuk peringkat kualitas daya. Hasil pengujian dikelompokkan dalam pelabelan lampu LED berdasarkan jumlah gambar bintang yang terdiri dari bintang 1, 2, 3 dan 4. Hasil pengujian dan pengelompokkan menunjukkan tingkat efikasi lampu LED sebesar 85 dari jumlah populasi lampu yang diuji berada pada kisaran nilai efikasi 63-104 lm/W, tingkat faktor daya 0.21-0.86, dan nilai THD-i 33-189 . Sebagai bagian dari pemahaman masyarakat tentang penghematan energi, diperkirakan penggunaan pelabelan lampu LED akan berkontribusi pada penghematan energi sebesar 18 GWh.

---

Labeling of household appliances in terms of energy consumption has been considered as one of the efforts to increase people awareness on energy saving. Recently, light emitting diode LED lamps have been widely utilized for lighting, replacing the conventional compact fluorescent and incandescent lamps, due to its low energy consumption. Because LED lamps work with switching procedures, it may produce distortion to the electrical power system. Furthermore, so far there are no rule or technical guidelines in Indonesia on labeling and grouping of the LED lamps.

This study firstly aimed at classifying the LED lamps through measuring the level of efficacy and power quality parameters, including power factor PF and total harmonic distortion of current THD I generated by LED lamps and grouped it based on efficacy and power quality. A numerous test of 2 13 W LED lamps was performed, following the procedure of Indonesian national standard SNI that adopted IEC 62612 2016. We employed the blue stars to indicate efficacy and yellow stars to indicate power quality level, respectively.

The results were then grouped for labeling using the number of stars 1, 2, 3 and 4. We found that the efficacy level of the most measured LED lamps 85 was in the range 63 ndash 104 lm W with PF and THD I of 0.21 0.86 and 33 189, respectively. As part of improved society understanding on energy saving, we predicted the labeling of the LED lamps will contribute to the energy saving of 18 GWh."

"The development of nitride-based light-emitting diodes (LEDs) has led to advancements in high-brightness LED technology for solid-state lighting, handheld electronics, and advanced bioengineering applications. Nitride Semiconductor Light-Emitting Diodes (LEDs) reviews the fabrication, performance, and applications of this technology that encompass the state-of-the-art material and device development, and practical nitride-based LED design considerations.Part one reviews the fabrication of nitride semiconductor LEDs. Chapters cover molecular beam epitaxy (MBE) growth of nitride semiconductors, modern metalorganic chemical vapor deposition (MOCVD) techniques and the growth of nitride-based materials, and gallium nitride (GaN)-on-sapphire and GaN-on-silicon technologies for LEDs. Nanostructured, non-polar and semi-polar nitride-based LEDs, as well as phosphor-coated nitride LEDs, are also discussed. Part two covers the performance of nitride LEDs, including photonic crystal LEDs, surface plasmon enhanced LEDs, color tuneable LEDs, and LEDs based on quantum wells and quantum dots. Further chapters discuss the development of LED encapsulation technology and the fundamental efficiency droop issues in gallium indium nitride (GaInN) LEDs. Finally, part three highlights applications of nitride LEDs, including liquid crystal display (LCD) backlighting, infrared emitters, and automotive lighting."

"An optical modulation by the use of bending effect developed from the effect of relative bending loss on optical fiber. The bending loss will decrease if the bending angle decreases. By varying the bending angle the bending loss will vary too. The modulation process obtained through this mechanism. The bending angle on optical fiber obtained from three mandrel laid on the loud-speaker; two mandrel on the frame and one on the cone of loud-speaker, while optical fiber laid between the mandrel. If current signal injected on coil loudspeaker, the coil will push the mandrel and then push optical fiber to form bending angle. The obtained 3 dB frequency response ranged from 28 Hz to 5714.3 Hz while the SNR and modulation index are 32.98 dB and 0.956 respectively. This modulator would be useable for single channel instrumentation and control links."

"The ability is see is fundamental to our very existence. How true our perceptions really are depends upon many factors, and not least is our understanding of what light is and how it interacts with matter. It was said that the camera, the icon of light recording instruments, never lies, and in the day of the glass plate and celluloid roll-film this might well have been true. But in this modern era, with electronic cameras and computer software, it is often safe to assume that the camera always lies. The advertising images that bombard our every waking moment are manipulated in shape, profile, color, and form. In this new era, light can be manipulated with metamaterials to make one object look like another or even cause that objects to vanish, literally before our eyes, not only can the image we see be manipulated, but so can the light itself."