Carbon dot grafted SrAl2O4:Eu, Dy dual-emitting phosphor for ratiometric temperature sensing. Issue 108 (20th October 2015)

• Record Type: Journal Article
• Authors: Lei, Bingfu; Li, Wei; Zhang, Haoran; Wang, Jin; Liu, Yingliang; Zhuang, Jianle; Chen, Shi
• Is Part Of: RSC advances. Volume 5:Issue 108(2015)
• Page Start: 89238
• Page End: 89243
• Publication Date: 2015-10-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra15463d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : We incorporated carbon dots (CDs) into a SrAl2 O4 :Eu, Dy phosphor (SAO), and made use of the dual emission from the CDs and SAO within such a composite to realize ratiometric temperature sensing from 100 to 400 K. Abstract : A simple and effective strategy has been carried out to design a ratiometric temperature sensor in this work. Carbon dots (CDs), which benefit from surface methoxysilyl groups after using an organosilane as a coordinating solvent, are highly reactive intermediates responsible for bonding with silanols and hydroxyl groups from the silica-coated SrAl2 O4 :Eu, Dy phosphor (SAO). Hence, a CD-grafted SrAl2 O4 :Eu, Dy phosphor (CD–SAO) could be realized using a facile one-step sol–gel method. The as-prepared CD–SAO shows the characteristic fluorescence emissions of CDs (blue) and SAO (green) at a single excitation wavelength. The temperature dependence of the fluorescence intensity ratios for the two emission bands was studied, and it turned out that the composite has a wide linear temperature sensing range, which matches well with physiologically relevant temperatures. This rather simple approach for creating dual emission enables a completely new strategy for the application of these composites in temperature sensing.