Hot electron light-emitting semiconductor heterostructure device--type 2

1995 ◽  
Vol 18 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Rita Gupta ◽  
N. Balkan ◽  
A. Teke ◽  
A. Straw ◽  
A. da Cunha
Keyword(s):  
Hot Electron ◽  
Light Emitting ◽  
Semiconductor Heterostructure ◽  
Device Type

Hot Electron Light Emitting Semiconductor Heterojunction Devices (Hellish) — Type — 1 and Type — 2

1996 ◽  
pp. 603-607 ◽  
Author(s):  
N. Balkan ◽  
A. da Cunha ◽  
A. O’Brien ◽  
A. Teke ◽  
R. Gupta ◽  
...  
Keyword(s):  
Hot Electron ◽  
Light Emitting ◽  
Heterojunction Devices

Hot electron light-emitting and lasing semiconductor heterostructures--type 1

1995 ◽  
Vol 18 (1) ◽  
pp. 33-43 ◽  
Author(s):  
A. Straw ◽  
N. Balkan ◽  
A. O'Brien ◽  
A. da Cunha ◽  
R. Gupta ◽  
...  
Keyword(s):  
Semiconductor Heterostructures ◽  
Hot Electron ◽  
Light Emitting

Investigation of the Temperature Degradation and Re-Activation of the Luminescent Centres in Rare Earth Implanted SiO2 Layers

2007 ◽  
Vol 131-133 ◽  
pp. 595-600
Author(s):  
S. Prucnal ◽  
L. Rebohle ◽  
Wolfgang Skorupa
Keyword(s):  
Rare Earth ◽  
Light Emitting Diode ◽  
Operating Time ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Hot Electron ◽  
Light Emitting ◽  
Hot Electron Injection ◽  
Quenching Process ◽  
Quenching Mechanisms

The temperature quenching mechanisms of the electroluminescence (EL) and the reactivation of the rare earth luminescent centres by the flash lamp annealing (FLA) made after hot electron injection into the SiO2 layer implanted by Tb and Gd was investigated. An increase of the temperature from room temperature up to 150oC reduces the gate voltage of about 3 V and increases the rate of the EL quenching process and the degradation of the Metal-Oxide-Silicon Light Emitting Diode (MOSLED) structure by a of factor of three. On the other hand, the post-injection FLA reactivates the RE centres switched off by electrons trapped around them during hot electron impact excitation, increasing the operating time of the MOSLEDs devices.

Low Cost Cooling Device for High Power LED Lamps

2020 ◽  
Author(s):  
Pamela Martinez-Vega ◽  
Araceli Lopez-Badillo ◽  
J. Luis Luviano-Ortiz ◽  
Abel Hernandez-Guerrero ◽  
Jaime G. Cervantes
Keyword(s):  
Reference Model ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Cost Effective ◽  
Heat Sinks ◽  
Modern World ◽  
Type Model ◽  
Light Emitting

Abstract The modern world progressively demands more energy; according to forecasts energy consumption will grow at an average annual rate of 3 percent. Therefore, it is necessary to purchase products or devices that are efficient and environmentally friendly. Technology in LED (Light Emitting Diode) lighting is presented as an alternative to energy saving, since LEDs have proven to be extremely efficient, have a long service life and their cost-effective ratio is very good. However, the heat emitted by the LED chip must be dissipated effectively, since the overheating of the chip reduces the efficiency and lifetime of the lamp. Therefore, heat sinks that are reliable, efficient and inexpensive should be designed and built. The present work proposes new designs for heat sinks in LED lamps, some of the models in the design of the fins refer to the Fibonacci series. The models proposed in the present work that have a significant advantage are the Type 1E Model (5.2% mass savings and better thermal efficiency of 8.33%), GR Type 1 Model (3.12% lighter and 3.33% more efficient) and the GRL Type Model (4. 51% mass savings and 5.55% thermally more efficient) compared to the Type 2 Reference Model proposed by Jang et al. [12].

scholarly journals Rancang Bangun Dan Pengujian Alat Pengering Solar Dryer Sederhana (Constructing and Experiment of Simple Solar Dryer)

2019 ◽  
Vol 8 (2) ◽  
pp. 48-57
Author(s):  
Frets Jonas Rieuwpassa ◽  
Stevy Imelda Murniati Wodi ◽  
Eko Cahyono ◽  
Rolando Pangumpia
Keyword(s):  
Water Content ◽  
Salt Water ◽  
Solar Dryer ◽  
Construction Products ◽  
Device Type ◽  
Product Water ◽  
Lower Water Content ◽  
Better Than

Solar dryer is a device that use solar energy to try substances. Using a solar dryer is more hygiene than drying directly into the sun. This experiment aims to construct a solar dryer device and to examine product water content. There are some steps in this experiment which are constructing a solar dryer device and examination of the product water content of two different solar device construction. Products that examined are mackerel tuna dried with salt and without salt. Water content examination is established every 4 hours and 12 hours. All data are examined descriptively. Results showed that temperature in device type 1 are between 40-45 0C dan device type 2 are between 44-45 0C. Results for water content in salted dry fish showed a score of 37.99% in device type 1 and 30.27% in device type 2. For water content in non-salted dry fish showed a score of 38.4% in device type 1 and 27.35% in device type 2. Base on this it can be concluded that device type 2 able to lower water content in products better than device type 1.

Acute effect of photobiomodulation using light-emitting diodes (LEDs) on baroreflex sensitivity during and after constant loading exercise in patients with type 2 diabetes mellitus

2019 ◽  
Vol 35 (2) ◽  
pp. 329-336
Author(s):  
Juliana Cristina Milan-Mattos ◽  
Cristina de Oliveira Francisco ◽  
Amanda Magdalena Ferroli-Fabrício ◽  
Vinicius Minatel ◽  
Ana Carolina Aparecida Marcondes ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Type 2 Diabetes ◽  
Type 2 Diabetes Mellitus ◽  
Baroreflex Sensitivity ◽  
Light Emitting Diodes ◽  
Acute Effect ◽  
Light Emitting ◽  
Constant Loading

Experimental Studies and Physical Model of Efficient, Tunable Injection Using Tunnel-Transparent Dielectric Contacts on Polymer Light-Emitting Devices

2002 ◽  
Vol 734 ◽  
Author(s):  
Ludmila Bakueva ◽  
Sergei Musikhin ◽  
Edward H. Sargent ◽  
Alexander Shik
Keyword(s):  
Dielectric Layer ◽  
Negative Differential Resistance ◽  
Voltage Drop ◽  
Strong Dependence ◽  
Experimental Studies ◽  
Differential Resistance ◽  
Hot Electron ◽  
Injection Efficiency ◽  
Light Emitting ◽  
Light Emitting Devices

ABSTRACTMost conducting polymers used for light-emitting devices have a small electron affinity, creating a high barrier for electron injection resulting in low injection efficiency. To improve injection characteristics, we fabricated and investigated multi-layer contacts with a tunneltransparent dielectric layer of nanometer thickness. Polymer layers were prepared by spin coating, and dielectric and metallic contact layers subsequently grown by vacuum deposition. Samples with such multi-layer cathodes demonstrated a current-voltage characteristic with negative differential resistance. At larger applied voltage, electroluminescence was observed with an efficiency larger than for a simple cathode of the same metal. We have developed a model to describe double injection through multi-layer contacts which explains these salient observed features. The increase in injection efficiency is caused by the voltage drop at the dielectric layer, shifting the metal Fermi level relative to the polymer molecular orbitals responsible for carrier transport. The negative differential resistance is explained by the strong dependence of dielectric tunnel transparency on voltage, a dependence which is qualitatively different for electrons and holes. Further flexibility in the functional characteristics of the injecting contacts is achieved through the use of an additional thin metallic layer playing the role of a base electrode, similar to hot-electron transistors with metallic base.

scholarly journals Hot electron effects on efficiency degradation in InGaN light emitting diodes and designs to mitigate them

2010 ◽  
Vol 108 (3) ◽  
pp. 033112 ◽  
Author(s):  
X. Ni ◽  
X. Li ◽  
J. Lee ◽  
S. Liu ◽  
V. Avrutin ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Hot Electron ◽  
Light Emitting ◽  
Electron Effects

Hot electron engineering for boosting electroluminescence efficiencies of silicon-rich nitride light emitting devices

2017 ◽  
Vol 183 ◽  
pp. 26-31 ◽  
Author(s):  
Y. Berencén ◽  
B. Mundet ◽  
J.A. Rodríguez ◽  
J. Montserrat ◽  
C. Domínguez ◽  
...  
Keyword(s):  
Hot Electron ◽  
Light Emitting ◽  
Light Emitting Devices

Multi-layer contacts for organic light-emitting diodes with enhanced injection efficiency

2001 ◽  
Vol 708 ◽  
Author(s):  
Ludmila Bakueva ◽  
Sergei Musikhin ◽  
Edward H. Sargent ◽  
Alexander Shik
Keyword(s):  
Dielectric Layer ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Hot Electron ◽  
Injection Efficiency ◽  
Light Emitting ◽  
Organic Light ◽  
Base Electrode ◽  
Wide Range

ABSTRACTA low level of electron injection is one of the major obstacles to achieving high-efficiency organic light-emitting diodes. With the goal of improving injection characteristics, we fabricated and investigated herein multi-layer contacts which included a tunnel-transparent dielectric layer of nanometer thickness. Polymer layers were prepared by the spin-coating method and dielectric and metallic contact layers grown by vacuum deposition. The voltage drop at this layer shifts the metal Fermi level relative to the polymer molecular orbitals responsible for the carrier transport, increasing the injection efficiency. The introduction of a suitably chosen dielectric layer results in an increase in the injection efficiency by up to a factor of several tens.Further sophistication of the injecting contacts consists in creating and additional intermediate thin metallic layer playing the role of the third, base electrode, similar to hot-electron transistors with metallic base. Additional bias applied to the base electrode permits variable injection efficiency and quantum yield over a wide range.

Sign in / Sign up

Export Citation Format

Share Document