NDLI: Efficiency of radiative emission from thin films of a light-emitting conjugated polymer

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Efficiency of radiative emission from thin films of a light-emitting conjugated polymer

Content Provider	Semantic Scholar
Author	Safonov, Alexei
Copyright Year	2001
Abstract	We examine the efficiency of radiative emission from thin layers of light-emitting conjugated polymers. We compare our experimental results for photoluminescence of the conjugated polymer poly ~2-methoxy, 5-~28-ethyl-hexyloxy! 1,4 phenylenevinylene ! ~MEH-PPV! with those of a theoretical model, finding good agreement between the two. The specially developed model takes into account several factors including absorption in the emissive layer, a spread of emitter sites within the layer, and the broad emission spectrum of the polymer. We find that the photoluminescence quantum efficiency for radiative emission of a bare MEHPPV film on a glass substrate is ;25%. We then apply our model to study electroluminescent devices. We show that for these structures the efficiency of radiative emission is ;10%. There is thus potential for considerable improvement in efficiency for both systems through recovery of some of the wasted waveguided light. Finally we use our model to reexamine some controversial results that indicate the probability of singlet exciton formation to be 0.4 60.05, and thus greater than the 0.25 expected from spin statistics. Our reanalysis supports a probability.0.25. We conclude by discussing the limitations of present models, including our own, in predicting the performance of realistic light-emitting diodes.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ore.exeter.ac.uk/repository/bitstream/handle/10036/37714/Efficiency%20of%20radiative.pdf;jsessionid=275A72306C35E7A51E31E8D60F01D77F?sequence=6
Language	English
Access Restriction	Open
Subject Keyword	Computer simulation Diode Emitter Device Component Exciton Immunostimulating conjugate (antigen) Lambert's cosine law Meteorological reanalysis Poly A Polymer Singlet state Solitary microtubule component of centriole or axonemal complex anatomical layer
Content Type	Text
Resource Type	Article

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