A rht‐Type Luminescent Zn (II)‐MOF Constructed by Triazine Hexacarboxylate Ligand: Tunable Luminescent Performance and White‐light Emission Regulation through doping Eu³⁺/Tb³⁺

Abstract

White‐light emitting materials have become a hot research field of luminescent MOF (Metal–Organic Framework) because of its high practical application value. Herein, we successfully synthesized and characterized a rht‐type fluorescent MOF Zn‐TDPAT [H6TDPAT = 2,4,6‐tris(3,5‐dicarboxylphenylamino)‐1,3,5‐triazine] with a topology of (3, 24) connected nodes. A series of MOFs materials x%Tb + y%Eu@Zn‐TDPAT were prepared by incorporating different concentrations of green emission center Tb3+ and red emission center Eu3+ into the blue‐emitting Zn‐MOF. The luminescence properties of MOFs materials x%Tb + y%Eu@Zn‐TDPAT can be effectively adjusted by incorporating different concentrations of Tb3+ and Eu3+ and can obtain multi‐color luminescence properties from blue, blue‐green, green, yellow green, yellow, blue‐red, yellow‐red and white. According to trichromatic mechanism, by reasonably matching the intensity of blue light, green light and red light emitted by x%Tb + y%Eu@Zn‐TDPAT at 420, 543 and 616 nm, MOFs materials 0.75%Tb + 5%Eu@Zn‐TDPAT, 0.65%Tb + 5.5%Eu@Zn‐TDPAT and 0.5%Tb + 7.5%Eu@Zn‐TDPAT with white‐light emission are obtained. Their CIE coordinates are 0.3162, 0.3345 (0.3162, 0.3345), (0.3138, 0.3339) and (0.3329, 0.3222), respectively, which are very close to ideal white‐light emission (0.3333,0.3333).

Structure of a Luminescent MOF-2 Derivative with a Core of Zn(II)-Terephthalate-Isoquinoline and Its Application in Sensing of Xylenes

“…There is a growing interest in the development of photoluminescent metal-organic materials (MOMs) [1][2][3][4], where the color emission upon excitation is a significant feature of these materials that has been recently used in several applications such as emitting devices/materials [5,6], optical sensing of vapor phase analytes [3,7], detection of ions [8,9], bioanalytes [10], explosives [11,12], and detection of volatile organic solvents (VOCs) [8,13,14]. Most known MOMs-based chemosensors for organic solvents act in a "turn-off" response where the fluorescence intensity of the compound is quenched upon addition of the analyte [7,15,16].…”

Lanthanide Isophthalate Metal‐Organic Frameworks: Crystal Structure, Thermal Behavior, and White Luminescence

“…Compared to the inorganic phosphors, LnMOFs compounds offer many advantages for the elaboration of new single‐phase phosphors such as their low temperature synthesis, the efficient antenna effect of the ligand, and the ease to homogenously co‐dope by Ln 3+ cation to generate various emission colors [19] . To conceive a single‐phase white‐luminescent MOF material, a promising approach consists in tuning the proportion of the blue emission of the organic ligand, the green light from Tb 3+ cation and the red color from Eu 3+ cation [11,13–18,20–26] . The tuning of relative proportion of each color can be optimized by adjusting the different amounts of the red and green emitters, but also by an adjustment of the excitation wavelength in order to modulate the blue emission of the ligand and obtain the required white emission [12,20] …”

“…Lanthanide-based MOFs (LnMOFs) are considered as promising functional materials for optical properties, especially due their luminescent properties that can be used for applications such as chemical or temperature sensing, lightings, displays [1][2][3][4][5][6][7][8] … Recently, LnMOFs have attracted increasing attention in the active field of single-phase white light emission materials. [9][10][11][12][13][14][15][16][17][18] Compared to the inorganic phosphors, LnMOFs compounds offer many advantages for the elaboration of new single-phase phosphors such as their low temperature synthesis, the efficient antenna effect of the ligand, and the ease to homogenously codope by Ln 3 + cation to generate various emission colors. [19] To conceive a single-phase white-luminescent MOF material, a promising approach consists in tuning the proportion of the blue emission of the organic ligand, the green light from Tb 3 + cation and the red color from Eu 3 + cation.…”

“…[19] To conceive a single-phase white-luminescent MOF material, a promising approach consists in tuning the proportion of the blue emission of the organic ligand, the green light from Tb 3 + cation and the red color from Eu 3 + cation. [11,[13][14][15][16][17][18][20][21][22][23][24][25][26] The tuning of relative proportion of each color can be optimized by adjusting the different amounts of the red and green emitters, but also by an adjustment of the excitation wavelength in order to modulate the blue emission of the ligand and obtain the required white emission. [12,20] For an efficient energy transfer from an organic linker to Eu 3 + and Tb 3 + ions, the ligand should have suitable triplet excited-state energy (between 22000 and 27000 cm À 1 ) matching the energy of the main accepting levels of Eu 3 + ( 5 D 1 : 19030 cm À 1 ) and Tb 3 + ( 5 D 4 : 20500 cm À 1 ).…”

Phosphor-Free Electrically Driven White Light Emission from Nanometer-Thick Barium–Organic Framework Films

“…It is known that lanthanides may involve f–f and d–f transitions, which are usually of high intensity, while d–d transitions for transition metals and s–p transitions involving s- and p-block elements are mostly broad . Apart from lanthanides, several single-component white light-emitting compounds have been reported using d-block − and p-block − elements, but they still pose environmental threats. An in-depth study of nanoscale single-component white light emitters is urgently needed.…”