Intrinsic White‐Light‐Emitting Metal–Organic Frameworks with Structurally Deformable Secondary Building Units

Abstract

Figure 4. a) Guest exchange of TMOF-5(Br) with Eu 3+ .b)Emission spectra of 0.2 mol %-exchanged Eu 3+ @TMOF-5(Br) upon 340 nm excitation. c) CIE chromaticity coordinates of 0.2 mol %-exchanged Eu 3+ @TMOF-5(Br) and TMOF-5(Br).

Highly Efficient Self-Trapped Bluish White-Light Emission from [Pb 4 Cl 5 ] 3+ Nodes in a Moisture-Tolerant Metal–Organic Framework

“…28 In contrast to free organoammonium cations templating conventional metal halide hybrids, our group has employed organocarboxylate anions as structuraldirecting agents to synthesize a class of ultrastable, cationic lead halide hybrids, including 3D [Pb 4 Br 6 ] 2+ frameworks, 2D [Pb 2 X 2 ] 2+ (X: Cl − /Br − ) layered materials, and open frameworks containing 1D [Pb 2 X 3 ] + (X: Cl − /Br − /I − ) chains. [29][30][31] The strong Pb-carboxylate linkages largely contribute to the high environmental moisture stability, and some of the cationic materials are even stable in a wide range of pH (3∼10) as well as aqueous boiling conditions for 24 h. 30,32,33 Moreover, the cationic haloplumbate units have strong structural strains over UV excitation, affording self-trapped, broadband white-light emissions despite low efficiencies (PLQY of 1∼15%). 31,34,35 Thus, the PLQYs of these cationic lead halide materials must be increased for commercial lighting applications.…”

Exploring Organic Metal Halides with Reversible Temperature‐Responsive Dual‐Emissive Photoluminescence

“…Normally, a characteristic green emission is detected for tetrahedral [MnX 4 ] 2− (X=Cl, Br, I) species, but a broad emission with large Stokes shift is rarely reported for these complexes. Low‐dimensional organic metal halides have been developed as white‐light‐emitting diodes, attributed to their broadband emission with large Stokes shift, resulting from STEs formation upon excitation . Hence, we attribute the emission peaks at 550 and 672 nm to the electronic transition of Mn 2+ complex in d 5 configuration and the radiative decay of STEs, respectively.…”

Recent Advances on the Applications of Luminescent Pb2+-Containing Metal–Organic Frameworks in White-Light Emission and Sensing

“…S1). Upon near-UV excitation, these materials exhibit intrinsic broadband emissions with a high colorrendering index (CRI) of up to 89 (Peng et al, 2019). Whereas their emissions of 11-13 are mainly originated from the [Pb 2 X 3 + ] moieties, the introduction of dicarboxylate linkers with rigid aromatic moiety was found to significantly enhance the contribution from the ligand-centered emission and was an effective means for tuning the luminescent properties of the MOFs.…”