what is the working principal of pic 16f877a used in lcd 16 by 2 display?pls give me replyyyyy sooon ....etc

[:=Read Full Message Here=:]

Definition

Scientific research in the area of semiconducting organic materials as the active substance in light emitting diodes (LEDs) has increased immensely during the last four decades. Organic semiconductors was first reported in the 60:s and then the materials where only considered to be merely a scientific curiosity. (They are named organic because they consist primarily of carbon, hydrogen and oxygen.). However when it was recognized in the eighties that many of them are photoconductive under visible light, industrial interests were a ....etc

[:=Read Full Message Here=:]

sir i need ppt on organic light emitting diode to present technical paper please send me me the link ....etc

[:=Read Full Message Here=:]

What Are Diodes Made Out Of?
Silicon (Si) and Germanium (Ge) are the two most common single elements that are used to make Diodes. A compound that is commonly used is Gallium Arsenide (GaAs), especially in the case of LEDs because of it’s large bandgap.
Silicon and Germanium are both group 4 elements, meaning they have 4 valence electrons. Their structure allows them to grow in a shape called the diamond lattice.
Gallium is a group 3 element while Arsenide is a group 5 element. When put together as a compou ....etc

[:=Read Full Message Here=:]

Definition
Scientific research in the area of semiconducting organic materials as the active substance in light emitting diodes (LEDs) has increased immensely during the last four decades. Organic semiconductors was first reported in the 60:s and then the materials where only considered to be merely a scientific curiosity. (They are named organic because they consist primarily of carbon, hydrogen and oxygen.). However when it was recognized in the eighties that many of them are photoconductive under visible light, industrial interests were att ....etc

[:=Read Full Message Here=:]

i need to gt the details of working princple,constrctn of led display units
....etc

[:=Read Full Message Here=:]

Abstract.
We examine the utility of Light-Emitting Diodes (LEDs) for short-range intersatellite links (ISLs), and compare and contrast LEDs with existing laser technologies used for long-distance ISLs. A hypothetical low-end LED ISL page link is described, and applications are suggested
Presented By:
Lloyd Wood
Surrey, England
Will Ivancic
NASA Glenn Research Center
Klaus-Peter Dörpelkus
Munich, Germany

1. INTRODUCTION
Current thinking on intersatellite page link communication is that ....etc

[:=Read Full Message Here=:]

POLYMER LIGHT EMITTING DIODES (PLEDs)

Ø Polymer LED (light-emitting diode) - sometimes called light-emitting polymer or polyLED - is a technology based on the use of polymer as the semiconductor material in LEDs.

Ø Polymers are chemical substances that consist of large molecules that are themselves, made from many smaller and simpler molecules.

Ø Polymers are largely identified with insulation.

Research institutes have come up with ideas to integrate polymers into main stream electronics as it has been establis ....etc

[:=Read Full Message Here=:]

Electrical Characteristics of n-ZnO/p-Si Heterojunction Diodes
4
Grown by Pulsed Laser Deposition at Different Oxygen
5
Pressures
6
7
R.S. AJIMSHA,
1
M.K. JAYARAJ,
1,3
and L.M. KUKREJA
2
8
1.”Optoelectronics Devices Laboratory, Department of Physics, Cochin University of Science and
9
Technology, Kochi 682022, India. 2.”Laser Materials Processing Division, Raja Ramanna Centre
10
for Advanced Technology, Indore 452013, India. 3.”e-mail: [email protected]
11
Heterojunction diodes of n-type ZnO/p-type silicon (1 ....etc

[:=Read Full Message Here=:]

Electrical Characteristics of n-ZnO/p-Si Heterojunction Diodes
4
Grown by Pulsed Laser Deposition at Different Oxygen
5
Pressures
6
7
R.S. AJIMSHA,
1
M.K. JAYARAJ,
1,3
and L.M. KUKREJA
2
8
1.”Optoelectronics Devices Laboratory, Department of Physics, Cochin University of Science and
9
Technology, Kochi 682022, India. 2.”Laser Materials Processing Division, Raja Ramanna Centre
10
for Advanced Technology, Indore 452013, India. 3.”e-mail: [email protected]
11
Heterojunction diodes of n-type ZnO/p-type silicon (1 ....etc

[:=Read Full Message Here=:]