A luminescent metal–organic framework with mixed-linker strategy for white-light-emitting by iridium-complex encapsulation

Luminescent MOFs (LMOFs): recent advancement towards a greener WLED technology

“…Following this report, several groups have tried to incorporate IR complexes inside the nanocavities of MOFs for WLED application. For example, Zhang et al 127 reported yellow emitting [Ir(ppy) 2 (bpy)][PF 6 ] being encapsulated inside a blue-emitting Zn based LMOF, [(Zn 4 O)(L)(2,6-naphthalic acid)]·4H 2 O DMF (JLNU-7) where H 4 L = methanetetra(tetrakis[4-(carboxyphenyl)oxamethyl]-methane acid. The quantum efficiency recorded in this case was 11.9% with CIE coordinates of (0.323, 0.298).…”

Energy Transfer in Metal–Organic Frameworks for Fluorescence Sensing

“…Metal–organic frameworks (MOFs) are porous-crystalline materials constructed from metal ions or metal clusters coordinated to organic ligands to form one-, two-, or three-dimensional structures, with an outstanding level of structural and compositional control. − Introducing emissive organic linkers or metal clusters may lead to the formation of MOF porous structures with interesting luminescent properties. These luminescent metal–organic frameworks (LMOFs) − have attracted tremendous attention over the past several years because of their abundant photophysical properties and enormous potential in sensing applications. ,− The rational design of LMOFs with energy transfer (ET) characteristics could maximally adjust the luminescent properties of these materials. − Because of the outstanding level of structural and compositional control via the flexible selection of organic linkers and metal clusters, energy transfer (ET) LMOFs (ET-LMOFs) are excellent candidates for a variety of potential applications including sensing, photocatalysis, solar cells, X-ray imaging scintillators, and many others. ,,− In addition, the coordination between organic linkers and metal nodes in MOFs allows a high degree of chromophore alignment and organization, , which is crucial for the modeling and understanding of the short- and long-distance energy transfer mechanisms. ,− The highly ordered and structured periodicity of MOFs also provide an ideal model for density functional theory (DFT) calculations, − which is one of the powerful tools for the predetermination of electronic structures and in-depth investigations of the mechanism that underpins the functions of MOFs.…”

Nanoporous Organic Frameworks as Light-Emitting Diodes: A Review

“…102 The resulting white-emitting Ir-complex@JLNU-7 possesses CIE coordinates of (0.323, 0.298) and a high PLQY value of 11.9% upon photoexcitation at 380 nm. 102 In a one-pot synthesis, glutathione-protected copper nanoclusters (GS-CuNCs) are encapsulated in the pores of MOF-5, which is composed of Zn 2+ and 1,4-BDC. 103 Coating the resulting GS-CuNCs@MOF-5 on a 365 nm UV light chip allows the fabrication of an orange LED.…”

“…101 In a similar manner, a yellow-emitting iridium complex, [Ir(ppy) 2 (bpy)][PF 6 ], is encapsulated in a blue-emitting MOF called JLNU-7. 102 The latter is composed of Zn 2+ metal ions and the mixed linkers methanetetrakis[tetrakis [4-(carboxyphenyl)oxamethyl]methane acid] and 2,6-NDC. 102 The resulting white-emitting Ir-complex@JLNU-7 possesses CIE coordinates of (0.323, 0.298) and a high PLQY value of 11.9% upon photoexcitation at 380 nm.…”

“…102 The latter is composed of Zn 2+ metal ions and the mixed linkers methanetetrakis[tetrakis [4-(carboxyphenyl)oxamethyl]methane acid] and 2,6-NDC. 102 The resulting white-emitting Ir-complex@JLNU-7 possesses CIE coordinates of (0.323, 0.298) and a high PLQY value of 11.9% upon photoexcitation at 380 nm. 102 In a one-pot synthesis, glutathione-protected copper nanoclusters (GS-CuNCs) are encapsulated in the pores of MOF-5, which is composed of Zn 2+ and 1,4-BDC.…”