Liquid Exfoliation of Decagonal Quasicrystals and Its Light Out‐Coupling Performance in Organic Light‐Emitting Devices

Decagonal quasicrystals are receiving considerable attention because of their unique crystallographic structure, electrical, magnetic, and mechanical properties. Hence, anisotropic decagonal nano-quasicrystals (NQCs) will have potential applications in multifunctional devices. Here, the decagonal NQCs are prepared from an anisotropic bulk sample by liquid exfoliation via the ultrasonic process at room temperature. The NQCs have high transmittance and are incorporated into green organic light-emitting diodes via solution and dry processes for light out-coupling. The overall device performance is markedly enhanced with NQC incorporation. A power efficacy of 31.4 lmW(-1) is achieved at 1000 cd m(-2) with a 37% increment for the solution-processed device. For the dry-processed device, 66.4 lmW(-1) is obtained with an increment of 108%. These NQCs can be made free standing, providing OLED devices an extremely convenient and effective measure for maximizing out-coupling of the generated light, near 80% of which would otherwise be trapped and wasted within.