A Luminescent Metal–Organic Framework with Mixed-Linker Strategy for White-Light-Emitting by Iridium-Complex Encapsulation

Abstract A luminescent MOF [(Zn4O)(L)(2,6-naphthalic acid)]·4H2O·DMF (JLNU-7, JLNU = Jilin Normal University, H4L = methanetetra(tetrakis[4-(carboxyphenyl)oxamethyl]-methane acid) has been hydrothermally synthesized and carefully characterized. The prepared JLNU-7 displayed permanent porosity in the air. Here we select a reasonable strategy to achieve efficient white-light emission by the combination of blue emission from JLNU-7 and yellow emission from [Ir(ppy)2(bpy)][PF6] (IrIII, Hppy = 2-phenylpyridine, bpy = 2,2ʹ-bipyridine). The blue-emitting JLNU-7 was synthesized as a platform for encapsulating yellow-emitting IrIII complex, namely IrIII@JLNU-7. IrIII@JLNU-7 displays white light emission with Commission International de I’Eclairage (CIE) coordinate of (0.323, 0.298) and high quantum yield up to 11.9 %. This strategy may promote the development and application of white phosphors with high performance in the practical lighting.