report for the pptx on the topic of organic led

1. INTRODUCTION
An OLED is any light emitting diode in which organic layers
are responsible for light emission.
OLEDs are solid-state devices madeup of thin films of
organic molecules that produce light
when exposed to strong electrical field. This layer of organic
material is situated between two
electrodes anode and cathode, all placed on a substrate.
OLED can be made extremely thin that
is about 200 times smaller than a human hair. The most
amazing fact of OLED technology is
that it is active display source meaning that it emits light
itself unlike the LCD technology that
is dependent on external backlight unit to produce light.

2. HISTROY
WORKING PRINCIPLE
OLEDs emit light in a similar manner to LEDs, through a

3. process that called
Electroluminescence. It is the result of recombination of
electrons and holes in a material.
Electroluminescence is a process in which a material emits light
in response to electrical field
applied across it. The excited electrons release their energy as
photons.
STRUCTURE OF OLED
The basic structure of an oled consists of two thin film of
organic material sandwiched
between two electrodes anode and cathode and light is
produced by recombination of holes and electrons at the
boundary of two organic layers. An OLEDconsists of the

4. following parts:
Cathode -The cathode injects electrons to
the organic layers when a current flows
through the device. It may be transparent
depending upon type of OLED.
? Organic layers - These layers are made of
organic
molecules
or
polymers.
The
thickness of the organic layer is between

5. (Figure 2) OLED Structure
100 and 150 nm.
?
Emissive layer - That transport electrons from the cathode. It is
termed as
emissive layer because the organic molecules in this layer are
responsible for
light emission. The organic material used here in the emissive
layer is
polyfluorene.
?
Conducting layer As the name suggest the organic material
used here is
conductive. The layer transport holes from cathode. The
conducting polymer

6. used in here is polyaniline.
? Anode - The anode removes electrons when a current flows
through the device. The
material used for anode must possess low work function such
that electron can be
removed easily. In order to observe the emitted light anode is
kept transparent and is
usually made of indium tin oxide (ITO).
? Substrate - The main function of substrate is to supports the
OLED structure and
provide mechanical strength to the thin organic layers. It is
usually made up of clear
plastic sheet, glass or metallic foil.

7. used in here is polyaniline.
? Anode - The anode removes electrons when a current flows
through the device. The
material used for anode must possess low work function such
that electron can be
removed easily. In order to observe the emitted light anode is
kept transparent and is
usually made of indium tin oxide (ITO).
? Substrate - The main function of substrate is to supports the
OLED structure and
provide mechanical strength to the thin organic layers. It is
usually made up of clear
plastic sheet, glass or metallic foil.