A fluorescence/phosphorescence dual-emitting metal-organic framework exhibiting two approaches for single-phase white-light emission

Abstract

The unique features of metal–organic frameworks (MOFs) endow the huge advantages for room-temperature phosphorescence (RTP) and as host matrices for multiple emission and single-phase white light. Herein, a new biluminescent MOF ([Cd3(TCPBDA)2]·8DMF·2H2O, 1) was successfully synthesized. Compound 1 itself exhibits the white-light emission due to fluorescence-phosphorescence dual emission. To the best of our knowledge, it is the first example that the single-phase white emission could be obtained by the construction of biluminescent MOF. Compound 1 was also employed as the energy transfer host matrix with the encapsulation of red guest emitter 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) into framework via one-pot process. The high energy transfer efficiency was occurred from host to guest, importantly, the single-phase phosphor DCM@1–1 (0.15 ​wt% DCM) displays warm white light with CIE coordinates of (0.33, 0.33). In addition, a WLED lamp with compound 1 as phosphor was prepared, exhibiting moderate correlated color temperature (CCT) of 4779 ​K and color-rendering index (CRI) of 71. These results open a new perspective for the development of single-phase white-light materials.