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A facile approach to make an efficient hybrid bulk heterojunction photovoltaic device with lead sulfide nanocrystals and a low‐bandgap polymer is demonstarted, resulting in a power conversion efficiency of about 2–3%.

Despite the high performance of OLEDs consisting of host–guest blend systems in the emissive layer, OLEDs containing a single molecule as an emitter in the emissive layer (i.e. non-doped OLEDs) have significant advantages including easy fabrication procedures and enhanced device stability.

Thermally activated delayed fluorescence materials exhibited outstanding external quantum efficiencies in OLEDs along with good CIE color coordinates and improved device stabilities. Hence these are most promising for commercialization of OLEDs.

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