writer：Jiachang Huang, Benzhao He, Zehong Cheng, Li Zhou*
keywords：Upconversion，NaYF4， hydrogel，temperature sensitivity
source：期刊
specific source：J. Lumin. 2015, 160, 254-257
Issue time：2015年

We present a one-step approach to combine the functional features of upconverting NaYF₄:Yb:Er nanoparticles and thermosensitive poly(N-isopropylacrylamide) (PNIPAM) for luminescence thermometry. Dual-functional hydrogel that simultaneously possess strong upconversion luminescence (UL) and temperature responsibility were fabricated based on the crosslinking of poly(acrylamide) in the presence of PNIPAM and NaYF₄:Yb:Er nanoparticles. The obtained hydrogel exhibited reversibly temperature-dependent UL and highly enhanced sensibility. The luminescence temperature sensitivity reached 1.9 % per ^oC and 0.7% per ^oC in the range of 27-33 ^oC and 35-45 ^oC, respectively. The maximum sensitivity could even reach 26.5 % per ^oC in the range of 33-35 ^oC. Considering the facile fabrication process and fine luminescence thermometry performance, this study thus opens up new opportunities for preparing highly sensitive temperature sensors.