scholarly journals Effect of Same-Temperature GaN Cap Layer on the InGaN/GaN Multiquantum Well of Green Light-Emitting Diode on Silicon Substrate

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Changda Zheng ◽  
Li Wang ◽  
Chunlan Mo ◽  
Wenqing Fang ◽  
Fengyi Jiang
Keyword(s):  
Quantum Wells ◽  
Light Emitting Diode ◽  
Green Light ◽  
Xrd Analysis ◽  
Light Emitting ◽  
Green Led ◽  
Cap Layer ◽  
Different Thickness ◽  
Ingan Quantum Wells

GaN green LED was grown on Si (111) substrate by MOCVD. To enhance the quality of InGaN/GaN MQWs, same-temperature (ST) GaN protection layers with different thickness of 8 Å, 15 Å, and 30 Å were induced after the InGaN quantum wells (QWs) layer. Results show that a relative thicker cap layer is benefit to get InGaN QWs with higher In percent at fixed well temperature and obtain better QW/QB interface. As the cap thickness increases, the indium distribution becomes homogeneous as verified by fluorescence microscope (FLM). The interface of MQWs turns to be abrupt from XRD analysis. The intensity of photoluminescence (PL) spectrum is increased and the FWHM becomes narrow.

A hybrid green light-emitting diode comprised of n-ZnO/(InGaN/GaN) multi-quantum-wells/p-GaN

2008 ◽  
Vol 93 (8) ◽  
pp. 081111 ◽  
Author(s):  
C. Bayram ◽  
F. Hosseini Teherani ◽  
D. J. Rogers ◽  
M. Razeghi
Keyword(s):  
Quantum Wells ◽  
Light Emitting Diode ◽  
Green Light ◽  
Light Emitting

scholarly journals Using Pre-TMIn Treatment to Improve the Optical Properties of Green Light Emitting Diodes

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Bing Xu ◽  
Hai Tao Dai ◽  
Shu Guo Wang ◽  
Fu-Chuan Chu ◽  
Chou-Hsiung Huang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Radiative Decay ◽  
Light Emitting Diodes ◽  
Light Output ◽  
Green Light ◽  
Time Resolved ◽  
Light Emitting ◽  
Transmission Electron ◽  
Green Led

We investigated the effects of pre-TMIn treatment on the optical properties of green light emitting diodes (LEDs). Although pre-TMIn treatment did not affect the epitaxial structure of quantum wells, it significantly improved the quality of the surface morphology relative to that of the untreated sample. Indium cluster can be seen by high-resolution transmission electron microscopy (HR-TEM), which is the explanation for the red-shift of photoluminescence (PL). Time-resolved photoluminescence measurements indicated that the sample prepared with pre-TMIn treatment had a shorter radiative decay time. As a result, the light output power of the treated green LED was higher than that of the conventional untreated one. Thus, pre-TMIn treatment appears to be a simple and efficient means of improving the performance of green LEDs.

Carrier loss and luminescence degradation in green-light-emitting InGaN quantum wells with micron-scale indium clusters

2003 ◽  
Vol 83 (13) ◽  
pp. 2578-2580 ◽  
Author(s):  
Yong-Hoon Cho ◽  
S. K. Lee ◽  
H. S. Kwack ◽  
J. Y. Kim ◽  
K. S. Lim ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Green Light ◽  
Light Emitting ◽  
Ingan Quantum Wells

Effect of internal electrostatic fields in InGaN quantum wells on the properties of green light emitting diodes

2007 ◽  
Vol 91 (4) ◽  
pp. 041915 ◽  
Author(s):  
Z. H. Wu ◽  
A. M. Fischer ◽  
F. A. Ponce ◽  
W. Lee ◽  
J. H. Ryou ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Light Emitting Diodes ◽  
Green Light ◽  
Light Emitting ◽  
Electrostatic Fields ◽  
Ingan Quantum Wells

Cyan Superluminescent Light-Emitting Diode Based on InGaN Quantum Wells

2012 ◽  
Vol 5 (8) ◽  
pp. 082105 ◽  
Author(s):  
Fabian Kopp ◽  
Teresa Lermer ◽  
Christoph Eichler ◽  
Uwe Strauss
Keyword(s):  
Quantum Wells ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Ingan Quantum Wells

scholarly journals Enhanced Device Performance of GaInN-Based Green Light-Emitting Diode with Sputtered AlN Buffer Layer

2019 ◽  
Vol 9 (4) ◽  
pp. 788 ◽  
Author(s):  
Seiji Ishimoto ◽  
Dong-Pyo Han ◽  
Kengo Yamamoto ◽  
Ryoya Mano ◽  
Satoshi Kamiyama ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Buffer Layer ◽  
Light Emitting Diode ◽  
Light Output ◽  
Green Light ◽  
Device Performance ◽  
Multiple Quantum ◽  
Light Emitting ◽  
Current Characteristics ◽  
Aln Buffer

In this study, we compared the device performance of GaInN-based green LEDs grown on c-plane sapphire substrates with a conventional low temperature GaN buffer layer to those with a sputtered-AlN buffer layer. The light output power and leakage current characteristics were significantly improved by just replacing the buffer layer with a sputtered-AlN layer. To understand the origin of the improvement in performance, the electrical and optical properties were compared by means of electro-reflectance spectroscopy, I–V curves, electroluminescence spectra, L–I curves, and internal quantum efficiencies. From the analysis of the results, we concluded that the improvement is mainly due to the mitigation of strain and reduction of the piezoelectric field in the multiple quantum wells active region.

scholarly journals LIGHT EMITTING DIODE (LED) HIJAU DAN PENGARUHNYA TERHADAP PENGURANGAN BYCATCH PENYU PADA PERIKANAN GILLNET DI PERAIRAN PALOH (Green Light Emitting Diode (LED) and its Effect on Sea Turtle Bycatch Reduction of Gillnet Fisheries in Paloh Waters)

2017 ◽  
Vol 8 (1) ◽  
pp. 87
Author(s):  
Ganang Dwi Prasetyo ◽  
Ronny Irawan Wahju ◽  
Roza Yusfiandayani ◽  
Mochammad Riyanto
Keyword(s):  
Light Emitting Diode ◽  
Green Light ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Innovative Technology ◽  
Light Emitting ◽  
Led Light ◽  
Green Led ◽  
Marine Megafauna ◽  
Led Lights

<div class="WordSection1"><p align="center"><strong><em>ABSTRACT</em></strong></p><p><em>Bycatch problem is a global issue and can be a driver of marine megafauna declines in the world, such as sea turtle, where is the animal's status as endangered species. Green Light Emitting Diode (LED) is known as an innovative technology to reduce sea turtle bycatch without reduce target catch effectively. </em><em>The </em><em>use</em><em> </em><em>of green LED in order to reduce sea turtle bycatch in gillnet fisheries was carried out in Paloh Coast, West Borneo during August to October 2015. Experiment performed a total of 20 settings with gillnet fleets operate two units simultaneously, ie gillnet control (without LED lights) and gillnet experiment (with LED lights). Turtles caught predominantly were in the juvenile phase as 57.14% and the potential location of capture sea turtle bycatch in station 2 (</em><em>1˚52' - 1˚56' LU and 109˚14' - 109˚18' BT)</em><em>. The results, showed that the green turtle (Chelonia mydas) were caught of 7 turtles, were captured by control gillnet 6 turtles with an CPUE 0.29 ± 0.03 Turtle/E, while by experimental gillnet 1 turtle with an CPUE by </em>0,04 ± 0,009<em> Turtle/E. The used of green LED light was significantly reduce sea turtle bycatch of 85% without decreasing target catch.</em><em></em></p><p class="TubuhTulisanAll"><strong><em>Keywords:</em></strong><strong><em> </em></strong><em>CPUE, green LED light</em><em>, </em><em>sea turtle bycatch</em><em></em></p><p align="center"><strong>ABSTRAK</strong></p><p class="Abstrakisi">Permasalahan terkait <em>bycatch </em>merupakan isu utama global yang dapat mengancam penurunan populasi megafauna laut seperti penyu yang telah berstatus <em>endangerd species</em>. Lampu LED merupakan inovasi teknologi untuk mengurangi <em>bycatch</em> penyu tanpa mengurangi hasil tangkapan ikan utama secara efektif. Penggunaan lampu <em>Light Emmitting Diode</em> (LED) hijau untuk mengurangi <em>bycatch</em> penyu pada perikanan jaring insang (<em>gillnet</em>) dilakukan di perairan Paloh, Kalimantan Barat selama bulan Agustus hingga Oktober 2015. Uji coba dilakukan dengan menggunakan 2 unit kapal <em>gillnet </em>yang dioperasikan di setiap stasiun pengamatan secara bersamaan dengan jumlah ulangan sebanyak 20 kali, diantaranya <em>gillnet</em> kontrol (tanpa lampu LED) dan <em>gillnet</em> eksperimen (dengan lampu LED). Penyu yang tertangkap cenderung didominasi oleh fase juvenile sebesar 57,14% dan lokasi potensi tertangkapnya <em>bycatch</em> penyu pada stasiun 2 (1˚52' - 1˚56' LU dan 109˚14' - 109˚18' BT). Hasil penelitian menunjukkan bahwa penyu yang tertangkap merupakan penyu hijau (<em>Chelonia mydas</em>) berjumlah 7 ekor, terdiri dari 6 ekor tertangkap pada <em>gillnet</em> kontrol dengan <em>CPUE</em> 0,29 ± 0,03  ekor/E, dan 1 ekor pada <em>gillnet </em>eksperimen dengan <em>CPUE</em> 0,04 ± 0,009 ekor/E. Penggunaan lampu LED hijau memberikan pengaruh secara <em>significant</em> untuk mengurangi <em>bycatch</em> penyu dengan persentase pengurangan sebesar 85% tanpa mengurangi hasil tangkapan ikan utama.</p><p class="TubuhTulisanAll" align="left"><strong>Kata kunci:</strong>  CPUE, lampu LED hijau, <em>bycatch</em> penyu</p></div>

scholarly journals Effects of LED light spectra on lettuce growth and nutritional composition

2017 ◽  
Vol 50 (6) ◽  
pp. 880-893 ◽  
Author(s):  
T Hytönen ◽  
P Pinho ◽  
M Rantanen ◽  
S Kariluoto ◽  
A Lampi ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Green Light ◽  
Biomass Accumulation ◽  
Nutritional Composition ◽  
Light Spectrum ◽  
Greenhouse Production ◽  
Light Emitting ◽  
Northern Latitudes ◽  
Save Energy

Year-round greenhouse production in northern latitudes depends on the use of artificial lighting. Light emitting diodes provide a promising means to save energy during cultivation as well as to modify the light spectrum to regulate the growth and quality of the crop. We compared the effects of light emitting diode lighting with different spectral compositions on the growth, development and nutritional quality of lettuce ( Lactuca sativa L. ‘Frillice’). We show that warm-white and warm-white supplemented with blue spectra provide equal growth and product quality compared to conventional high-pressure sodium lighting in the absence and presence of daylight. Our data indicate that for biomass accumulation, the far-red component in the light spectrum is more critical than green light or the red/blue ratio. Furthermore, we demonstrate that a red + blue spectrum increases the concentration of several vitamins in lettuce. However, biomass accumulation using this spectrum was insufficient when daylight was excluded.

scholarly journals Development of High Power Green Light Emitting Diode Chips

2005 ◽  
Vol 10 ◽  
Author(s):  
Christian Wetzel ◽  
T. Detchprobhm
Keyword(s):  
Quantum Wells ◽  
Light Emitting Diode ◽  
Green Light ◽  
High Yield ◽  
Production Scale ◽  
Light Emitting ◽  
Force Microscopy ◽  
Atomic Force ◽  
High Emission ◽  
Optimization Schemes

The development of high emission power green light emitting diodes chips using GaInN/GaN multi quantum well heterostructures on sapphire substrate in our group is being reviewed. We analyze the electronic bandstructure in highly polarized GaInN/GaN quantum wells to identify the appropriate device structures. We describe the optimization of the epitaxial growth for highest device performance. Applying several optimization schemes, we find that lateral smoothness and homogeneity of the active region as characterized by atomic force microscopy is a most telling character of high yield, high output power devices emitting near 525 nm. In un-encapsulated epi-up mounted (400 μm)2 die we achieve 2.5 mW at 20 mA at 525 nm. We describe die performance, wafer yield, and process stability, and reproducibility for our production-scale implementation of this green LED die process.

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