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Angular Dependence of the Emission from a Conjugated Polymer Light‐Emitting Diode: Implications for efficiency calculations
Author(s) -
Greenham Neil C.,
Friend Richard H.,
Bradley Donal D. C.
Publication year - 1994
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19940060612
Subject(s) - electroluminescence , light emitting diode , materials science , diode , optoelectronics , polymer , light emission , conjugated system , optics , nanotechnology , physics , composite material , layer (electronics)
The ability to compare electroluminescence efficiencies is important now that light‐emitting diodes (LEDs) have been constructed using many different polymers and different device structures. Various ways of defining and measuring the efficiency of polymer LEDs are discussed, revealing the need to understand the nature and orgin of the angular dependence of the emission. A model for the angular distribution of the emitted light is proposed and measurements of the ligh output of a polymer LED described whose results are consitent with the model.