This PDF file includes:

• Fig. S1. UV-vis absorption spectra.
• Fig. S2. Time-resolved PL spectra of D:A co-deposited films.
• Fig. S3. The dependence of exciton energy on distance between D and A.
• Fig. S4. Dependence of EL spectra on luminance.
• Fig. S5. Time-resolved EL spectra for a device with spacing layer thickness d = 100 Å.
• Fig. S6. External EL quantum efficiency for a device with spacing layer and for a device with a D:A co-deposited film as an emissive layer.
• Fig. S7. Performance of an OLED with an ADN spacer layer.

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