Red Room-Temperature Phosphorescence of CDs@Zeolite Composites Triggered by Heteroatoms in Zeolite Frameworks

Abstract

Carbon dots (CDs) with red-emitting room-temperature phosphorescence (RTP) are rarely reported because of the increasing nonradiative decay of the excited states and the decreasing energy gap between the excited states and ground states. Herein, we demonstrate a facile strategy for modulating the RTP properties of CDs in terms of donor–acceptor energy transfer (EnT) in the CDs-in-zeolite system. Upon tuning of the heteroatoms (Zn 2+ , Mn 2+ ) doped in the aluminophosphate zeolite frameworks, CDs@zeolite composites with green and red phosphorescence have been prepared via in situ hydrothermal synthesis. In such composites, the zeolite matrix provides an efficient confinement role in stabilizing the triplet states of CDs. Significantly, the Mn-doped zeolite could act as an energy acceptor allowing EnT from excitons of CDs to the dopant in the host matrix, generating the intriguing red RTP behavior. This work provides an effective strategy for developing CD-based composite materials with special RTP emissions as well as new fields for applications.

Inorganic nanocrystal-dynamic porous polymer assemblies with effective energy transfer for sensitive diagnosis of urine copper

“…Carbon quantum dots with high-prole optical properties as energy donors overcome the limitations of COF's optical performance. [36][37][38][39][40] On the strength of their structural traits, CD particles were immobilized on the COF frameworks via hydrogen-bond interaction (Fig. S1 †).…”

Zeolite-confined carbon dots: tuning thermally activated delayed fluorescence emission via energy transfer

“…[21][22][23] For instance, Yan's group reported a TADF-assisted ET route between two small organic molecules to prolong the RTP lifetime to 2 s. 24 More recently, our group prepared a red RTP CD-based composite based on ET between CDs and a Mn-doped zeolite matrix. 25 Inspired by these studies, we hypothesize that the ET process might be also feasible between two kinds of CDs with matched energy levels in a zeolite matrix, thus affording the tuning of the photoluminescence properties.…”

Revival of Zeolite‐Templated Nanocarbon Materials: Recent Advances in Energy Storage and Conversion

“…In general, solvothermal/hydrothermal synthesis is adopted to prepare nanocarbon materials and matrix simultaneously in one system. [141,160] Li et al first proposed the concept of in situ formation process of carbon dots (CDs) in zeolites. [141,160] By using solvothermal method, a series of CDs were prepared accompanied with the crystallization of zeolite in one-pot reaction, in which the CDs can be in situ encapsulated and confined in the zeolite matrix (Figure 6a,h).…”

“…Fortunately, there have been a few papers related to luminescence properties of CDs confined in zeolites. [16,141,160,[172][173][174][175][176][177][178][179] Despite multitudinous zeolite-templated nanocarbon materials have already been reported including CDs, CNTs, graphene nanosheets and 3D graphene-like porous carbons, diversity of their structure, and morphology still has development space, such as burgeoning carbon nanocages. Furthermore, it can be predicted that zeolite template can be extended to prepare other nanostructures such as black phosphorous, [281] perovskite, [282] MoS 2 , [283] BN, [284,285] etc.…”