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 Varshini fitting - Low temperature PL - InGaN		  New Topic  Reply to Topic
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physgopal

India
4 Posts
Posted - 11/16/2015 :  12:24:29 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic


Dear All,
Can anyone tell how to fit a varshini fitting and the parameter values such as alpha and beta for InGaN material. i tried many times, but the fitting line shows the straight line rather than exponential curve with the experimental data. Please give me a suggestions..

Thanking you...
M.Gopalakrishnan

M.Gopalakrishnan

jasonzhao

China
262 Posts
Posted - 11/16/2015 :  02:31:20 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello,

Would you please tell us that what's the function formula? or show us a simple example?

Best regards!
Jason
OriginLab Technical Service
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physgopal

India
4 Posts
Posted - 11/17/2015 :  12:30:53 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Dear Jasonzhao,
thank you so much for your reply. This is the function,
E(T)=E(0)-AT^2/(T+B)
where A is Alpha and B is Beta..

M.Gopalakrishnan
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jasonzhao

China
262 Posts
Posted - 11/17/2015 :  01:06:23 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello,


It seems not a complex function, but it may not show an exponential shape when B is rather small,
You can use this tool to plot the curve:
http://www.originlab.com/doc/Origin-Help/PD-Dialog-2DFunc-Tab
Then you will see the curve shape at different parameter.


Best regards!
Jason
OriginLab Technical Service
Edited by - jasonzhao on 11/17/2015 01:07:50 AM
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