Multicolor Random Lasers Based on Perovskite Quantum Dots Embedded in Intrinsic Pb–MOFs

Abstract

Perovskite quantum dots (PQDs) have attracted extensive attention for various applications due to their hallmark optoelectronic properties. However, PQD gain materials are usually needed to be integrated with an external cavity to acquire effective optical feedback for lasing oscillation, which generally suffers from stringent fabrication procedures and the destruction of their pristine gain performance. In this work, we propose an approach to realize a new class of random lasers that are constructed by in situ precipitating perovskite quantum dots (PQDs) in metal–organic frameworks (MOFs). Such random lasers make full use of the combined merits of MOFs showing a high refractive index and a broad transmission window and that of PQDs exhibiting high optical gain. A lead-based MOF is utilized as a matrix, which allows us to grow PQDs at the Pb2+ sites in situ and thus produce high-density PQDs gain in MOFs. We experimentally demonstrate low-threshold multicolor random lasers achieved in the visible spectral range with different wavelengths through compositional modulation in the nanoporous environment of MOF nanostructures and illustrate potential applications of the developed PQDs@MOFs random laser as the illumination source in the speckle-free optical imaging. This study will pave the way for the construction of perovskite-based lasing in multifunctional systems.

Stable and Bright CsPbX3 Nanocrystals in Metal–Organic Frameworks for White Light-Emitting Diodes

“…13 Compared to other MOFs with outstanding adsorption properties, white Pb-MOF powders exhibit great potential as a luminescent matrix. 33 The Pb-MOFs were added, and they acted as substrates to provide Pb 2+ sites for the in situ synthesis of CsPbBr 3 NCs and obtain high-density CsPbBr 3 @Pb-MOF composites. The irregular rectangular morphology shown in Figure 1b 220) planes of cubic CsPbBr 3 NCs, respectively.…”

“…It has been reported that Pb 2+ coordinated with a 1,3,5-H 3 BTC 2– molecule and two H 2 O molecules to form a two-dimensional polymer structure in aqueous solution . Compared to other MOFs with outstanding adsorption properties, white Pb-MOF powders exhibit great potential as a luminescent matrix . The Pb-MOFs were added, and they acted as substrates to provide Pb 2+ sites for the in situ synthesis of CsPbBr 3 NCs and obtain high-density CsPbBr 3 @Pb-MOF composites.…”

Europium/1,3,5-Benzenetricarboxylic Acid Metal–Organic Framework Nanorods Decorated with CdSe Quantum Dots as Coatings for Noncontact Ratiometric Optical Temperature Sensing

“…For example, the reversible luminescence intensity changes and spectral shifts of CdSe QD clusters have illustrated the potential for developing sensors based on quantum dot nanoscale components. However, there are still certain flaws accompanying the application of quantum dots, such as weak temperature resistance, which leads to reduced optical performances of quantum dot sensors and rapid annihilation at higher temperatures. , Besides, the limited accuracy of quantum dot sensors and the requirement to adjust their laser intensity and distance during monitoring processes further restrict their application as sensors. Therefore, achieving high ubiquity, high accuracy, and noncontact temperature detection in the existing technology for detecting the workings condition of mechanical components remains a dilemma.…”

Metal–organic framework-based self-healing hydrogel fiber random lasers

“…11 Secondly, MOFs usually have a high refractive index, and thus, provide vital feedback to photons. 12,13 MOFs can also easily form high-quality micro/nano-sized crystals that can be used as natural micro/nano optical cavities. By combining these above advantages, some micro/nanolasers based on MOFs have been reported successively in recent years.…”