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Schematic diagrams of the devices A, B, C, and D.
The measured transient PL intensity of devices A (open circles) and B (open triangles) with the total thickness of organic layers of . The inset shows the Purcell factors of the two devices and the intrinsic spectrum of Eu complexes.
Internal quantum efficiency varies as a function of the normalized exciton lifetime for various .
Exciton lifetime as a function of total thickness of organic layers for (a) based devices A and B and (b) bath based devices C and D.
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