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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
95-6 Displays and Recorders
such that η = τ/τ
r
. e reason that a fast recombination time is crucial is that the longer the carrier
re
mains
in an ex
cited
st
ate,
th
e
la
rger
th
e
pr
obability
th
at
it wi
ll
gi
ve
ou
t
en
ergy
no
nradiatively
. In or
der
fo
r
th
e
in
ternal
qu
antum
e
ciency
to be hi
gh,
th
e
ra
diative
li
fetime
τ
r
needs to be small. For indirect
ba
nd-gap
se
miconductors,
τ
r
τ
nr
so that very little light is generated, and for direct band-gap semi-
conductors,
τ
r
increases with temperature so that the internal quantum eciency deteriorates with the
te
mperature
.
95.4 LED Response Time
As long as the LEDs are used as display devices, it is not too i ...
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Publisher Resources

ISBN: 9781439848913