X. D. Wang , O. S. Wolfbeis , R. J. Meier . Luminescent probes and sensors for temperature . Chem. Soc. Rev. , 2013 . 42 7834 -7869 . DOI:10.1039/c3cs60102ahttp://doi.org/10.1039/c3cs60102a .

H. Suo , 等 . Rational design of ratiometric luminescence thermometry based on thermally coupled levels for bioapplications . Laser Photonics Rev. , 2021 . 15 2000319 DOI:10.1002/lpor.202000319http://doi.org/10.1002/lpor.202000319 .

X. C. Qiu , 等 . Ratiometric upconversion nanothermometry with dual emission at the same wavelength decoded via a time-resolved technique . Nat. Commun. , 2020 . 11 4 DOI:10.1038/s41467-019-13796-whttp://doi.org/10.1038/s41467-019-13796-w .

F. Auzel . Upconversion processes in coupled ion systems . J. Lumin. , 1990 . 45 341 -345 . DOI:10.1016/0022-2313(90)90189-Ihttp://doi.org/10.1016/0022-2313(90)90189-I .

F. Auzel . Upconversion and anti-stokes processes with f and d ions in solids . Chem. Rev. , 2004 . 104 139 -174 . DOI:10.1021/cr020357ghttp://doi.org/10.1021/cr020357g .

F. Wang , X. G. Liu . Recent advances in the chemistry of lanthanide-doped upconversion nanocrystals . Chem. Soc. Rev. , 2009 . 38 976 -989 . DOI:10.1039/b809132nhttp://doi.org/10.1039/b809132n .

G. Y. Chen , 等 . Upconversion nanoparticles: design, nanochemistry, and applications in theranostics . Chem. Rev. , 2014 . 114 5161 -5214 . DOI:10.1021/cr400425hhttp://doi.org/10.1021/cr400425h .

X. F. Wu , 等 . Nanoscale ultrasensitive temperature sensing based on upconversion nanoparticles with lattice self-adaptation . Nano Lett. , 2021 . 21 272 -278 . DOI:10.1021/acs.nanolett.0c03637http://doi.org/10.1021/acs.nanolett.0c03637 .

B. Zhou , 等 . Controlling upconversion nanocrystals for emerging applications . Nat. Nanotechnol. , 2015 . 10 924 -936 . DOI:10.1038/nnano.2015.251http://doi.org/10.1038/nnano.2015.251 .

Y. Zhang , X. H. Zhu , Y. Zhang . Exploring heterostructured upconversion nanoparticles: from rational engineering to diverse applications . ACS Nano , 2021 . 15 3709 -3735 . DOI:10.1021/acsnano.0c09231http://doi.org/10.1021/acsnano.0c09231 .

S. B. Liu , 等 . Controlling upconversion in emerging multilayer core-shell nanostructures: from fundamentals to frontier applications . Chem. Soc. Rev. , 2022 . 51 1729 -1765 . DOI:10.1039/D1CS00753Jhttp://doi.org/10.1039/D1CS00753J .

D. M. Liu , 等 . Three-dimensional controlled growth of monodisperse sub-50 nm heterogeneous nanocrystals . Nat. Commun. , 2016 . 7 10254 DOI:10.1038/ncomms10254http://doi.org/10.1038/ncomms10254 .

L. H. Li , 等 . Niobium pentoxide hollow nanospheres with enhanced visible light photocatalytic activity . J. Mater. Chem. A , 2013 . 1 11894 -11900 . DOI:10.1039/c3ta12599hhttp://doi.org/10.1039/c3ta12599h .

R. An , 等 . Hollow nanoparticles synthesized via Ostwald ripening and their upconversion luminescence-mediated Boltzmann thermometry over a wide temperature range . Light Sci. Appl. , 2022 . 11 217 DOI:10.1038/s41377-022-00867-9http://doi.org/10.1038/s41377-022-00867-9 .