How to measure the external quantum efficiency of OLEDs?

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Discussion Overview

The discussion centers on the measurement of external quantum efficiency (EQE) in organic light emitting diodes (OLEDs). Participants are exploring the calculation methods and extraction techniques related to EQE, seeking documentation and guidance on the topic.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses a need for documentation on how to calculate the external quantum efficiency of OLEDs, mentioning the relevance of solid angle and critical angle.
  • Another participant suggests a Wikipedia link as a resource, but it is later noted that it does not provide information on measuring EQE.
  • A subsequent reply acknowledges the inadequacy of the suggested resource and offers a link to a Japanese journal article as a potentially more useful reference.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the resources available for calculating EQE, with some expressing frustration over the lack of detailed information in suggested references.

Contextual Notes

Participants indicate limitations in the available literature regarding the measurement techniques for EQE, highlighting a gap in the documentation they have encountered.

Mr. Johnson
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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
 
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Mr. Johnson said:
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.
 
I have...It says nothing about measuring the EQE.
 
Mr. Johnson said:
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.
 
Last edited:
Ok. Thank you.
 

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