Color Tuning and White Light Emission via in Situ Doping of Luminescent Lanthanide Metal–Organic Frameworks

Abstract

Isostructural lanthanide metal-organic frameworks (MOFs) are synthesized through the spontaneous self-assembly of H3BTPCA (1,1',1″-(benzene-1,3,5-triyl)tripiperidine-4-carboxylic acid) ligands and lanthanide ions (we term these MOFs Ln-BTPCA, Ln = La(3+), Tb(3+), Sm(3+), etc.). Prompted by the observation that the different lanthanide ions have identical coordination environment in these MOFs, we explored and succeeded in the preparation of mixed-lanthanide analogues of the single-lanthanide MOFs by way of in situ doping using a mixture of lanthanide salts. With careful adjustment of the relative concentration of the lanthanide ions, the color of the luminescence can be modulated, and white light-emission can indeed be achieved. The mechanisms possibly responsible for the observed photophysical properties of these mixed-lanthanide MOFs are also discussed.

Group 3 Elements and Lanthanide Metals

“…The mixing of Ln 3+ ions for white light emission was applied in the isostructural Ln-BTPCA-MOFs (1,1 ′ ,1 ′′ -(benzene-1,3,5-triyl)tripiperidine-4-carboxylate (BTPCA)). La, Tb, and Eu in concentrations of 10, 30, and 60 mol% give a white light-emitting MOF with excellent CIE chromaticity coordinates (0.3161, 0.3212) [142]. As the energy transfer to the metal ions is not complete, the MOF linker is responsible for a broadband emission with its maximum in the blue region of the visible spectrum; Eu 3+ and Tb 3+ add 4f-based red and green components so that a single-source three-color emitter is created.…”

Structural characterization of three semi-rigid tetracarboxylate-containing transition-metal coordination polymers

“…Metal-multicarboxylate CPs not only possess the rich structures [6][7][8][9][10], many interesting physical properties have also been investigated [11][12][13][14][15][16][17][18][19][20]. For example, (i) porous metal-multicarboxylate CPs can selectively adsorb gases, in particular H 2 (for energy storage) and CO 2 (for purification of the environment) [21][22][23][24][25]; (ii) Zn 2+ /Cd 2+ /Ln 3+ -multicarboxylate CPs can emit light.…”

Flexible composite nanobelts: facile electrospinning construction, structure and color-tunable photoluminescence

“…The prepared phosphors have potential applications in field emission display devices. Tang et al [16] developed a simple and facile one-step approach for the synthesis of lanthanide metal-organic frameworks. With careful adjustment of the relative concentration of the lanthanide ions, the color of the luminescence can be modulated, and white-light emission can indeed be achieved.…”