time resolved Photoluminescence analysis

by ezimah
Tags: analysis, gallium nitride, lifetime, photoluminescence, resolved, time, time resolved
ezimah is offline
Dec2-13, 06:34 AM
P: 2
Currently we are working on gallium nitride material where I'm required to analyze the time resolved photoluminescence (PL) result. From literature review we found that many reported on lifetime decay value [itex]\tau[/itex] so could anyone explain how to find this value. Does it come from the time resolved PL slope or there any specific equation we need to uses?
Phys.Org News Partner Physics news on Phys.org
Chameleon crystals could enable active camouflage (w/ video)
Atomic switcheroo explains origins of thin-film solar cell mystery
X-ray laser experiment explores how specially shocked material gets stronger
Cthugha is offline
Dec2-13, 10:11 AM
Sci Advisor
P: 1,563
GaN has a direct band gap, so one usually just assumes that the decay of the signal is an exponential decay and the decay constant is the lifetime decay value. What may happen is that there are several possible decay channels, for example radiative and nonradiative ones. In that case one would expect a multi-exponential decay showing more than one time scale. However, this is usually already quite easy to spot in a log plot of the decay.

The other thing you might want or need to worry about is the detection. It may make a difference whether you have a detector integrating over the whole emission spectrum or a spectrally resolving one as the PL spectrum may change over the PL duration. Usually doing both is fine as long as you mention what you actually measured.
ezimah is offline
Dec9-13, 09:45 PM
P: 2
Thank for the reply.it's help me a lot.

Register to reply

Related Discussions
Photoluminescence experiment Atomic, Solid State, Comp. Physics 1
Time Dilation Paradox (Not resolved) Special & General Relativity 99
Photoluminescence vs Absorption Atomic, Solid State, Comp. Physics 1
Reference for photoluminescence data? Atomic, Solid State, Comp. Physics 2
information on photoluminescence? Quantum Physics 2