How to measure the external quantum efficiency of OLEDs?

[Mr. Johnson]

Hello PF,

I am currently studying OLEDs (organic light emitting diodes) and have been reading many articles pertaining to the external quantum efficiency of these devices and the various extraction techniques used. In all of these articles, they state the increase of efficiency but do not state how it calculated.

I have been trying to find documentation that describes the calculation for the external efficiency.

I know that it has to do with a solid angle and critical angle (ITR).

Does anybody have a clue? or know where to guide me?

Thanks

 

[sankalpmittal]

Hello PF,

I am currently studying OLEDs (organic light emitting diodes) and have been reading many articles pertaining to the external quantum efficiency of these devices and the various extraction techniques used. In all of these articles, they state the increase of efficiency but do not state how it calculated.

I have been trying to find documentation that describes the calculation for the external efficiency.

I know that it has to do with a solid angle and critical angle (ITR).

Does anybody have a clue? or know where to guide me?

Thanks

Your answer is in here: http://en.wikipedia.org/wiki/OLED

Read it.

 

[Mr. Johnson]

I have...It says nothing about measuring the EQE.

 

[sankalpmittal]

I have...It says nothing about measuring the EQE.

Hii,

Yes you are right. I blindly posted it! :pOk, see this Japanese Journal :

http://jjap.jsap.jp/link?JJAP/43/7733/

Download the PDF.

 

[Mr. Johnson]

Ok. Thank you.