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In situ measurement of the internal luminescence quantum efficiency in organic light-emitting diodes
1.R. H. Friend, R. W. Gymer, A. B. Holmes, J. H. Burroughes, R. N. Marks, C. Taliani, D. D. C. Bradley, D. A. Dos Santos, J. L. Bredas, M. Lögdlund, and W. R. Salaneck, Nature (London) 397, 121 (1999).
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12.An approximation of refractive index and extinction coefficient within the wavelength region is ( [nm]/100): substrate: , ; ITO: , ; PEDOT:PSS: , ; HTL: , ; EML: , ; Ba/Ag-Cathode: The Barium layer was neglected and the optical properties of Silver were taken from Handbook of Optical Constants of Solids, E. D. Palik edited by (Academic, New York, 1991).
13.Details on this measurement will be reported elsewhere.
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The internal luminescencequantum efficiency is one limiting factor for the performance of organic light-emitting diodes.Photoluminescencemeasurements are frequently used to estimate but these neglect effects of the local environment of the emissive sites and the electrical excitation mechanism. We present a method for the in situmeasurement of under electrical operation. The current efficiency of several devices with different emitter-cathode distances is quantitatively compared. Precise optical simulation allows determining without additional assumptions.
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