Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes.

ABSTRACT: Divalent europium 5d-4f transition has aroused great attention in many fields, in a way of doping Eu²⁺ ions into inorganic solids. However, molecular Eu²⁺ complexes with 5d-4f transition are thought to be too air-unstable to explore their applications. In this work, we synthesized four Eu²⁺-containing azacryptates EuX₂-N_n (X = Br, I, n = 4, 8) and systematically studied the photophysical properties in crystalline samples and solutions. Intriguingly, the EuX₂-N₈ complexes exhibit near-unity photoluminescence quantum yield, good air-/thermal-stability and mechanochromic property (X = I). Furthermore, we proved the application of Eu²⁺ complexes in organic light-emitting diodes (OLEDs) with high efficiency

SUBMITTER: Li J 

PROVIDER: S-EPMC7562750 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature