Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 43, Pages 49014-49025Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c15079
Keywords
nanoscale metal-organic framework; luminescent thermometer; confinement effect; lanthanide; postsynthetic modification
Funding
- PARAM Yukti Facility under the National Supercomputing Mission, Government of India at JNCASR, Bangalore
- CSIR (Government of India)
- JNCASR
- Department of Science and Technology (DST) [CRG/2019/005951]
- RAK-CAM (UAE)
- Life Sciences Research, Education and Training at JNCASR [DBT/JNCASR/D0004/2018/00159:-4547]
- ICMS
- SSL
- SAMat research facility, Sheikh Saqr senior fellowship
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Extensive research has been conducted in recent years on the successful preparation of highly sensitive nanoscale luminescent thermometers. A unique design and easy synthesis method have been used to create Zr-ctpy-NMOF@TbxEuy compounds, which can detect temperature changes with high sensitivity. Additionally, temperature-modulated multispectrum chromism has been achieved.
In recent years, extensive research has been directed toward the successful preparation of nanoscale luminescent thermometers with high sensitivities operative in a broad temperature range. To achieve this goal, we have devised a unique design and facile multistep synthesis of Zr-ctpy-NMOF@ TbxEuy compounds by confining Ln-complexes (Ln = Eu3+/Tb3+) into a robust grafting of 4-(4'-carboxyphenyl)-2,2':6,2 '' terpyridine ligand (ctpy) with a high triplet state energy and corresponding immobilization of bimetallic Ln(3+) ions resulted in yellow light-emitting Zr-ctpy-NMOF@Tb1.66Eu0.14 to achieve a sensitivity of 5.2% K-1 (thermal uncertainty dT < 1 K) operative over a broad temperature range of 25-400 K. To defeat the odds related to the detection of minute temperature changes using luminescent materials, we prepared a white light-emitting Zr-ctpy-NMOF@Tb1.4Eu0.31 that showed temperature-modulated multispectrum chromism where the color drastically changes from green (at 25 K, Q.Y.: 20.21%) to yellowish-green (at 200 K, Q.Y.: 23.13%) to white (at 300 K, Q.Y.: 26.4%) to orange (at 350 K, Q.Y.: 26.93%) and finally red (at 400 K, Q.Y.: 28.2%) with a high energy transfer efficiency of 49.8%, which is further supported by electron-phonon coupling.
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