Luminescent properties and recent progress in applications of lanthanide metal-organic frameworks

Construction of High Quantum Yield Lanthanide Luminescent MOF Platform by In Situ Doping and Its Temperature Sensing Performance

“…Therefore, organic ligands are required to sensitize Ln 3+ to emit light through the “antenna effect”. According to previous reports and experience, the rate of intersystem crossing (ISC) within ligands can be obviously enhanced when it has a certain energy difference (Δ E > 5000 cm –1 ) between the first singlet excited state and the triplet energy level of organic ligands . When the triplet energy level of the ligand is well matched with the excited-state vibrational energy levels of Ln 3+ ions, that is, when the energy level difference is within a certain range, the possibility of energy transfer from the ligand to Ln 3+ can be effectively increased.…”

“…According to previous reports and experience, the rate of intersystem crossing (ISC) within ligands can be obviously enhanced when it has a certain energy difference (ΔE > 5000 cm −1 ) between the first singlet excited state and the triplet energy level of organic ligands. 54 When the triplet energy level of the ligand is well matched with the excited-state vibrational energy levels of Ln 3+ ions, that is, when the energy level difference is within a certain range, the possibility of energy transfer from the ligand to Ln 3+ can be effectively increased. The excited-state vibrational energy levels ( 4 G 5/2 , 5 D 0 , 5 D 4 , 4 F 9/2 ) corresponding to four of these Ln 3+ ions (Sm 3+ , Eu 3+ , Tb 3+ , Dy 3+ ) are 17 800, 17 250, 20 430, and 20 960, respectively.…”

Constructing an AIE Diphenylquinoxaline-Based Luminescent Europium-Organic Framework for Multiple Substance Sensing

“…In the past decades, metal–organic frameworks (MOFs) have successfully drawn a great deal of attention due to their advantageous features such as structure diversity and tunability, open metal sites, and large surface areas. − In particular, the easy predesign and postmodification of MOFs provide access for enhancing the interactions between the host and analytes to improve sensing performance, which allows them to be widely employed for sensor design. − In addition, MOF-based sensors always have good performances in recyclable usability. , Among these luminescence MOFs, Ln-MOFs show great potential for being sensing materials because of the good luminescent nature of lanthanide nodes and the tunable antenna effect from the ligand to the lanthanide center that can be regulated through the interaction with different analytes, thus facilizing the ratiometric emission. − It should be noted that luminescence efficiency is considered one of the important parameters for sensing materials. As we know, some luminescent materials show terrible emissions at their solid state or high concentration.…”

A water stable and highly fluorescent Zn(ii) based metal–organic framework for fast detection of Hg2+, CrVI, and antibiotics

“…[1][2][3][4][5][6][7][8] A series of LMOFs have been reported to be used to quickly detect inorganic ions and small organic molecules due to their high sensitivity and selectivity. [9][10][11][12][13][14][15][16] In addition, LMOFs with water stability are highly desirable and their performances are severely limited owing to the lack of water stability. The development of LMOFs with desired functionality and high stability in water remains an ongoing challenge.…”