TCTA:B3PYMPM 2.06´10 5 s -1 ). As a result, the device gives a higher efficiency with an EQEmax of 34.2%, which only slightly decreased to 31% at a luminescence of 1000 cd m -2 . obtained by the integration with respect to emission wavelengths with weighting of the PL intensity. (d) Dependence of the out-coupling mode on the thicknesses of hole and electrontransport layers. However, the close structural analogue, 3CzTRZ (λPL: 468 nm; τd: 415 μs; ΔEST: not reported; ΦPL 72%; 6 wt% in PPT), seems to be oriented randomly in the solid state. 3CzTRZ