A new innovation in the field of science

2. GRAPHENE LIGHT
BULB

3. Introduction
History
GRAPHENE : GRAPHITE+ENE
Structure
Salient features of Graphene
Thermal Properties
Anomalous Graphene
Working
Applications
Challenges to Unlock
Disadvantage
Reference
CONTENTS

4. INTRODUCTION
BULB: THE ILLUMINATION REVELUTION
October 21,1879 life of men changed with an
innovation invention.
At Melno Park,New Jersey Edison invented
electric light bulb.
From the day bulb has taken new forms.
Graphene light bulb: Most modern product of
technology.

5. ‘Graphene’ was first isolated in the lab by Professor Andre Geim
with former student Konstantin Novoselov at the University of
Manchester, England in 2004
HISTORY

6. GRAPHENE : GRAPHITE+ENE
•British-Dutch physicist Andre Geim defines "
graphene is a single atomic plane of graphite,
which is sufficiently isolated from environment
to be free standing ".
•Graphene can be described as a one-atom thick
layer of graphite.
•It is the basic structural element of other
allotropes, including graphite, charcoal, carbon
nanotubes and fullerenes.

7. STRUCTURE
• A crystalline allotrope of
carbon.
• 2 Dimensional structure
in atomic scale.
• These carbon atoms are
bound within the plane
by strong bonds into a
honeycomb array
comprised of six-
membered rings.

8. • By stacking of these layers on top of each other,
the well known 3-dimensional graphite crystal is
formed.
• It is a basic building block for graphitic materials
of all other dimensionalities.
• It can be wrapped up into 0D fullerenes, rolled
into 1D nanotubes or stacked into 3D graphite.
• Thus, graphene is nothing else than a single
graphite layer.

10. • Thinness material.
• Strongest.
• Electrically Conductive.
• Flexible & Stretchable.
• Transparent.
• Elastic.
• Stiff.
• Harder than diamond and steel
etc.
SALIENT FEATURES OF GRAPHENE

11. THERMAL PROPERTIES
• Graphene is a perfect thermal conductor
• Its thermal conductivity is much higher than all the other
carbon structures as carbon nanotubes, graphite and
diamond at room temperature and better by far than
brilliant heat conductors such as silver and copper
• Graphite, the 3 D version of Graphene, shows a thermal
conductivity about 5 times smaller

12. ANOMALOUS GRAPHENE
•At high temperatures graphene becomes
a poor conductor "Umklapp scattering".
•Temperatures confine to a hot spot at
center.
•Electron temperature is higher than of
acoustic vibrational mode of graphene
lattice, so less energy is needed to attain
temperature for visible light emission.

13. •Single layer GRAPHENE is
made as the filament of
the bulb.
GRAPHENE LIGHT BULB
•GRAPHENE is attached to metal electrodes, current
allowed to flow, filament heats up, at about 2500
degrees Celsius light of visible range is produced.

14. WORKING
•Graphene is freely suspended and is electrically biased.
•A clean Graphene channel is established using current
induced annealing method.
•At high temperature (~2800 K) hot electrons get spacially
localized at center of suspended Graphene.
•The suspended Graphene channel begin to emit visible
light at the center once the voltage exceeds threshold
value.
BRIGHT VISIBLE LIGHT EMISSION OF GRAPHENE

15. ADVANTAGES OF GRAPHENE LIGHT BULB
oThinnest bulb.
oBrightest bulb.
oNo self heating.
o20% more efficient than LED bulb.
oLast around 25 years.
oEasily recyclable.

16. Graphene as a light source.
Advancements in touch
screens.
Hand holding transparent
future tablet.
Graphene transistor.
Graphene integrated circuits.
Organic light-emitting
diodes(OLED)s
APPLICATIONS

17. CHALLENGES TO UNLOCK
• Single sheet of graphene is hard to
produce.
• Production of Graphene is highly costly.
• The new fabrication & manufacturing
methods of Graphene has to be evolved
used in electronic device .

18. DISADVANTAGE
•The main disadvantage of graphene as a catalyst is
its susceptibility to oxidative environments.
•Research has proven that graphene exhibits some toxic
qualities.
•Scientists discovered that graphene features jagged
edges that can easily pierce cell membranes, allowin
g it to enter into the cell and disrupt normal functio
ns.

19. “Bright visible light emission from graphene”, Nature
Nanotechnology
“Graphene photonics and optoelectronics", Nature
Photon
phys.org
Wikipedia.org
Reference

20. Presented By:
Jefry John
Sachu Sanil