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Red Room-Temperature Phosphorescence of CDs@Zeolite Composites Triggered by Heteroatoms in Zeolite Frameworks
journal contribution
posted on 2019-01-18, 21:19 authored by Bolun Wang, Ying Mu, Hongyue Zhang, Huaizhong Shi, Guangrui Chen, Yue Yu, Ziqi Yang, Jiyang Li, Jihong YuCarbon 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 (Zn2+, Mn2+) 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.
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Keywords
Zeolite Frameworks Carbon dotsRTP behaviorzeolite matrixCDs-in-zeolite systemhost matrixhydrothermal synthesisRTP emissionstriplet statesaluminophosphate zeolite frameworksRed Room-Temperature Phosphorescencered-emitting room-temperature phosphorescenceconfinement roleenergy gapenergy acceptorRTP propertiesnonradiative decayMn-doped zeoliteground states
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