[1] WU P, ZHU Y, LIU S Y, et al. Modular design of high-brightness pH-activatable near-infrared BODIPY probes for noninvasive fluorescence detection of deep-seated early breast cancer bone metastasis: remarkable axial substituent effect on performance[J]. ACS Central Science, 7, 2039-2048(2021).

[2] XIONG H, KOS P, YAN Y F, et al. Activatable water-soluble probes enhance tumor imaging by responding to dysregulated pH and exhibiting high tumor-to-liver fluorescence emission contrast[J]. Bioconjugate Chemistry, 27, 1737-1744(2016).

[3] LI Y H, SUN Y, LI J C, et al. Ultrasensitive near-infrared fluorescence-enhanced probe for in vivo nitroreductase imaging[J]. Journal of the American Chemical Society, 137, 6407-6416(2015).

[4] LI Y H, DENG Y, LIU J, et al. A near-infrared frequency upconversion probe for nitroreductase detection and hypoxia tumor in vivo imaging[J]. Sensors and Actuators B:Chemical, 286, 337-345(2019).

[5] ZHENG X, KANKALA R K, LIU C G, et al. Lanthanides-doped near-infrared active upconversion nanocrystals: upconversion mechanisms and synthesis[J]. Coordination Chemistry Reviews, 438, 213870(2021).

[6] ZHU L, YE C Q, DAI G L, et al. Highly-efficient upconversion via direct one-photon absorption of xanthene-based chromophores[J]. Dyes and Pigments, 172, 107853(2020).

[7] LIU Y, SU Q Q, ZOU X M, et al. Near-infrared in vivo bioimaging using a molecular upconversion probe[J]. Chemical Communications, 52, 7466-7469(2016).

[8] ZHOU J, LIU Z, LI F Y. Upconversion nanophosphors for small-animal imaging[J]. Chemical Society Reviews, 41, 1323-1349(2012).

[9] GAJDOS T, HOOP B, ERDELYI M. Hot-Band Anti-Stokes Fluorescence Properties of Alexa Fluor 568[J]. Journal of Fluorescence, 30, 437-443(2020).

[10] HAN J L, ZHANG J, ZHAO T H, et al. Photoswitchable photon upconversion from turn-on mode fluorescent diarylethenes[J]. CCS Chemistry, 3, 665-674(2021).

[11] ZHU X H, ZHANG J, LIU J L, et al. Recent progress of rare-earth doped upconversion nanoparticles: synthesis, optimization, and applications[J]. Advanced Science, 6, 1901358(2019).

[12] HOU Z Y, ZHANG Y X, DENG K R, et al. UV-emitting upconversion-based TiO₂ photosensitizing nanoplatform: near-infrared light mediated in vivo photodynamic therapy via mitochondria-involved apoptosis pathway[J]. ACS Nano, 9, 2584-2599(2015).

[13] GONG N Q, MA X W, YE X X, et al. Carbon-dot-supported atomically dispersed gold as a mitochondrial oxidative stress amplifier for cancer treatment[J]. Nature Nanotechnology, 14, 379-387(2019).

[14] BELALI S, KARIMI A R, HADIZADEH M. Cell-specific and pH-sensitive nanostructure hydrogel based on chitosan as a photosensitizer carrier for selective photodynamic therapy[J]. International Journal of Biological Macromolecules, 110, 437-448(2018).

[15] XU J, XU L G, WANG C Y, et al. Near-infrared-triggered photodynamic therapy with multitasking upconversion nanoparticles in combination with checkpoint blockade for immunotherapy of colorectal cancer[J]. ACS Nano, 11, 4463-4474(2017).

[16] HOU W J, LIU Y, JIANG Y, et al. Aptamer-based multifunctional ligand-modified UCNPs for targeted PDT and bioimaging[J]. Nanoscale, 10, 10986-10990(2018).

[17] CHAN M H, PAN Y T, LEE I J, et al. Minimizing the heat effect of photodynamic therapy based on inorganic nanocomposites mediated by 808 nm near-infrared light[J]. Small, 13, 1700038(2017).

[18] GUAN M R, DONG H, GE J C, et al. Multifunctional upconversion–nanoparticles–trismethylpyridylporphyrin–fullerene nanocomposite: a near-infrared light-triggered theranostic platform for imaging-guided photodynamic therapy[J]. NPG Asia Materials, 7, e205(2015).

[19] ZHANG T, LIN H M, CUI L R, et al. Near infrared light triggered reactive oxygen species responsive upconversion nanoplatform for drug delivery and photodynamic therapy[J]. European Journal of Inorganic Chemistry, 2016, 1206-1213(2016).

[20] HU C L, ZHANG Z X, LIU S N, et al. Monodispersed CuSe sensitized covalent organic framework photosensitizer with an enhanced photodynamic and photothermal effect for cancer therapy[J]. ACS Applied Materials & Interfaces, 11, 23072-23082(2019).

[21] ZHANG M K, WANG X G, ZHU J Y, et al. Double-targeting explosible nanofirework for tumor ignition to guide tumor-depth photothermal therapy[J]. Small, 14, 1800292(2018).

[22] CHENG L, YANG K, LI Y G, et al. Facile preparation of multifunctional upconversion nanoprobes for multimodal imaging and dual-targeted photothermal therapy[J]. Angewandte Chemie International Edition, 50, 7385-7390(2011).

[23] ZHU X J, FENG W, CHANG J, et al. Temperature-feedback upconversion nanocomposite for accurate photothermal therapy at facile temperature[J]. Nature Communications, 7, 10437(2016).

[24] XU M Z, XUE B, WANG Y, et al. Temperature-feedback nanoplatform for NIR-II penta-modal imaging-guided synergistic photothermal therapy and CAR-NK immunotherapy of lung cancer[J]. Small, 17, 2101397(2021).

[25] FENG L L, HE F, DAI Y L, et al. A versatile near infrared light triggered dual-photosensitizer for synchronous bioimaging and photodynamic therapy[J]. ACS Applied Materials & Interfaces, 9, 12993-13008(2017).

[26] ZHANG Y, REN K W, ZHANG X B, et al. Photo-tearable tape close-wrapped upconversion nanocapsules for near-infrared modulated efficient siRNA delivery and therapy[J]. Biomaterials, 163, 55-66(2018).

[27] JIN Y Y, NI D L, GAO L, et al. Harness the power of upconversion nanoparticles for spectral computed tomography diagnosis of osteosarcoma[J]. Advanced Functional Materials, 28, 1802656(2018).

[28] LIU Y N, ZHANG C, LIU H, et al. Controllable synthesis of up-conversion nanoparticles UCNPs@MIL-PEG for pH-responsive drug delivery and potential up-conversion luminescence/magnetic resonance dual-mode imaging[J]. Journal of Alloys and Compounds, 749, 939-947(2018).

[29] DAI Y L, MA P A, CHENG Z Y, et al. Up-conversion cell imaging and pH- induced thermally controlled drug release from NaYF₄: Yb³⁺/Er³⁺@hydrogel core-shell hybrid microspheres[J]. ACS Nano, 6, 3327-3338(2012).

[30] HAN S Y, SAMANTA A, XIE X J, et al. Gold and hairpin DNA functionalization of upconversion nanocrystals for imaging and in vivo drug delivery[J]. Advanced Materials, 29, 1700244(2017).

[31] JAIN R K, HU C, GUSTAFSON T K, et al. Absorption processes associated with anti-Stokes fluorescence in rhodamine B solutions[J]. Journal of Applied Physics, 44, 3157-3161(1973).

[32] ZHU X J, SU Q Q, FENG W, et al. Anti-Stokes shift luminescent materials for bio-applications[J]. Chemical Society Reviews, 46, 1025-1039(2017).

[33] LIU Y, SU Q Q, CHEN M, et al. Near-infrared upconversion chemodosimeter for in vivo detection of Cu²⁺ in Wilson disease[J]. Advanced Materials, 28, 6625-6630(2016).

[34] YANG H R, HAN C M, ZHU X J, et al. Upconversion luminescent chemodosimeter based on nir organic dye for monitoring methylmercury in vivo[J]. Advanced Functional Materials, 26, 1945-1953(2016).

[35] XIA F Y, CHEN S R, YE C Q, et al. Dual-channel NO₂⁻/Hg²⁺ detections based on upconversion/downshifting[J]. Journal of Luminescence, 226, 117476(2020).

[36] ZHU W C, QIAN X L, WANG J, et al. Near-infrared frequency upconversion probes for monitoring glutathione S-transferase to evaluate acute liver injury[J]. Sensors and Actuators B:Chemical, 347, 130640(2021).

[37] CHEN T H, ZHANG S W, JAISHI M, et al. New near-infrared fluorescent probes with single-photon anti-stokes-shift fluorescence for sensitive determination of pH variances in lysosomes with a double-checked capability[J]. ACS Applied Bio Materials, 1, 549-560(2018).

[38] DONG Z, HAN Q X, MOU Z L, et al. A reversible frequency upconversion probe for real-time intracellular lysosome-pH detection and subcellular imaging[J]. Journal of Materials Chemistry B, 6, 1322-1327(2018).

[39] YU H, SUN W L, TIEMUER A, et al. Mitochondria targeted near-infrared chemodosimeter for upconversion luminescence bioimaging of hypoxia[J]. Chemical Communications, 57, 5207-5210(2021).

[40] TIAN R S, SUN W, LI M L, et al. Development of a novel anti-tumor theranostic platform: a near-infrared molecular upconversion sensitizer for deep-seated cancer photodynamic therapy[J]. Chemical Science, 10, 10106-10112(2019).

[41] ZHOU H, ZENG X D, LI A G, et al. Upconversion NIR-II fluorophores for mitochondria-targeted cancer imaging and photothermal therapy[J]. Nature Communication, 11, 6183(2020).

[42] JIA T, WANG Q H, XU M, et al. Highly efficient BODIPY-doped upconversion nanoparticles for deep-red luminescence bioimaging in vivo[J]. Chemical Communication, 57, 1518-1521(2021).

[43] ASKES S H C, BAHREMAN A, BONNET S. Activation of a photodissociative ruthenium complex by triplet-triplet annihilation upconversion in liposomes[J]. Angewandte Chemie International Edition, 53, 1029-1033(2014).

[44] LI L, ZHANG C, XU L, et al. Luminescence ratiometric nanothermometry regulated by tailoring annihilators of triplet-triplet annihilation upconversion nanomicelles[J]. Angewandte Chemie International Edition, 60, 26725-26733(2021).

[45] HUANG L, ZHAO Y, ZHANG H, et al. Expanding anti-stokes shifting in triplet-Triplet annihilation upconversion for in vivo anticancer prodrug activation[J]. Angewandte Chemie International Edition, 56, 14400-14404(2017).

[46] LV W, LONG K Q, YANG Y, et al. A red light-triggered drug release system based on one-photon upconversion-like photolysis[J]. Advanced Healthcare Materials, 9, 2001118(2020).

[47] HE G S, TAN L S, ZHENG Q D, et al. Multiphoton absorbing materials: molecular designs, characterizations, and applications[J]. Chemical Reviews, 108, 1245-1330(2008).

[48] KAISER W, GARRETT C G B. Two-photon excitation in CaF₂: Eu²⁺[J]. Physical Review Letters, 7, 229-231(1961).

[49] GUO L, GE J C, LIU Q, et al. Versatile polymer nanoparticles as two-photon-triggered photosensitizers for simultaneous cellular, deep-tissue imaging, and photodynamic therapy[J]. Advanced Healthcare Materials, 6, 1601431(2017).

[50] HU W B, XIE M, ZHAO H, et al. Nitric oxide activatable photosensitizer accompanying extremely elevated two-photon absorption for efficient fluorescence imaging and photodynamic therapy[J]. Chemical Science, 9, 999-1005(2018).

[51] GU B B, WU W B, XU G X, et al. Precise two-photon photodynamic therapy using an efficient photosensitizer with aggregation-induced emission characteristics[J]. Advanced Materials, 29, 1701076(2017).

[52] YANG L L, ZHANG L, WAN S C, et al. Two-photon absorption induced cancer immunotherapy using covalent organic frameworks[J]. Advanced Functional Materials, 31, 2103056(2021).

[53] ZHAO Z Z, QIU K Q, LIU J P, et al. Two-photon photodynamic ablation of tumour cells using an RGD peptide-conjugated ruthenium(II) photosensitiser[J]. Chemical Communications, 56, 12542-12545(2020).

[54] ZENG L L, KUANG S, LI G Y, et al. A GSH-activatable ruthenium(II)-azo photosensitizer for two-photon photodynamic therapy[J]. Chemical Communications, 53, 1977-1980(2017).

[55] TIAN X H, ZHU Y Z, ZHANG M Z, et al. Localization matters: a nuclear targeting two-photon absorption iridium complex in photodynamic therapy[J]. Chemical Communications, 53, 3303-3306(2017).

[56] ZHANG H H, ZHU X J, LIU G, et al. Conformationally induced off-on two-photon fluorescent bioprobes for dynamically tracking the interactions among multiple organelles[J]. Analytical Chemistry, 91, 6730-6737(2019).

[57] DU W, SHAO T, WANG L, et al. Two-photon fluorogenic probe off γ-glutamyl transpeptidase for cancer cells identification with simultaneous oxidative stress monitoring[J]. Dyes and Pigments, 200, 110155(2022).