[1] [1] HE B, FENG M, CHEN X Y, et al. Fabrication of potassium ion decorated 1D/2D g-C3N4/g-C3N4 homojunction enabled by dual-ions synergistic strategy for enhanced photocatalytic activity towards degradation of organic pollutants［J］. Applied Surface Science, 2022, 575: 151695.

[2] [2] HU X N, ZHANG Y, WANG B J, et al. Novel g-C3N4/BiOClxI1-x nanosheets with rich oxygen vacancies for enhanced photocatalytic degradation of organic contaminants under visible and simulated solar light［J］. Applied Catalysis B: Environmental, 2019, 256: 117789.

[3] [3] SUN Q, SUN Y, ZHOU M Y, et al. A 2D/3D g-C3N4/ZnO heterojunction enhanced visible-light driven photocatalytic activity for sulfonamides degradation［J］. Ceramics International, 2022, 48(5): 7283-7290.

[4] [4] VILLABONA-LEAL E G, LPEZ-NEIRA J P, PEDRAZA-AVELLA J A, et al. Screening of factors influencing the photocatalytic activity of TiO2∶Ln (Ln=La, Ce, Pr, Nd, Sm, Eu and Gd) in the degradation of dyes［J］. Computational Materials Science, 2015, 107: 48-53.

[5] [5] MENG Q S, WANG T, LIU E Z, et al. Understanding electronic and optical properties of anatase TiO2 photocatalysts co-doped with nitrogen and transition metals［J］. Physical Chemistry Chemical Physics, 2013, 15(24): 9549-9561.

[6] [6] FISCHER S, GOLDSCHMIDT J C, LPER P, et al. Enhancement of silicon solar cell efficiency by upconversion: optical and electrical characterization［J］. Journal of Applied Physics, 2010, 108(4): 044912.

[7] [7] CASTAEDA J, MENESES-NAVA M A, BARBOSA-GARCA O, et al. The red emission in two and three steps up-conversion process in a doped erbium SiO2-TiO2 sol-gel powder［J］. Journal of Luminescence, 2003, 102/103: 504-509.

[8] [8] FIDELUS J D, ZHYDACHEVSKII Y, PASZKOWICZ W, et al. Enhancement of luminescence of nanocrystalline TiO2∶Yb3+ nanopowders due to co-doping with Nd3+ ions［J］. Optical Materials, 2015, 47: 361-365.

[9] [9] MAZIERSKI P, MIKOLAJCZYK A, GRZYB T, et al. On the excitation mechanism of visible responsible Er-TiO2 system proved by experimental and theoretical investigations for boosting photocatalytic activity［J］. Applied Surface Science, 2020, 527: 146815.

[10] [10] VENDRUSCOLO V, GIORDANO L, CONSTANTINO V R L, et al. Yb3+/Er3+ co-doped Dion-Jacobson niobium layered perovskites as NIR-to-green upconversion materials［J］. New Journal of Chemistry, 2020, 44(24): 10165-10171.

[12] [12] ZHANG Q Z, YANG F, XU Z H, et al. Are lanthanide-doped upconversion materials good candidates for photocatalysis［J］. Nanoscale Horiz, 2019, 4(3): 579.

[13] [13] YANG M Q, GAO M M, HONG M H, et al. Visible-to-NIR photon harvesting: progressive engineering of catalysts for solar-powered environmental purification and fuel production［J］. Adv Mater, 2018, 30(47): 1802894.

[14] [14] FUJISHIMA A, HONDA K. Electrochemical photolysis of water at a semiconductor electrode［J］. Nature, 238, 37-38.

[16] [16] SIMMONS W B, HANSON S L, FALSTER A U. Samarskite-(Yb): a new species of the samarskite group from the Little Patsy pegmatite, Jefferson County, Colorado［J］. The Canadian Mineralogist, 2006, 44(5): 1119-1125.

[19] [19] HUANG J, YE X H, LI W J, et al. Infrared-to-visible upconversion enhanced photothermal catalytic degradation of toluene over Yb3+, Er3+∶CeO2/attapulgite nanocomposite: effect of rare earth doping［J］. Journal of Industrial and Engineering Chemistry, 2022, 116: 504-514.

[20] [20] XIN M. Upconversion luminescence of ZnO∶Er, Yb, Li prepared by a hydrothermal method［J］. Journal of Materials Science: Materials in Electronics, 2023, 34(5): 1-6.

[21] [21] AHMAD I. Inexpensive and quick photocatalytic activity of rare earth (Er, Yb) co-doped ZnO nanoparticles for degradation of methyl orange dye［J］. Separation and Purification Technology, 2019, 227: 115726.

[22] [22] LI X Y, LI W J, LIU X T, et al. The construction of Yb/Er/Pr triple-doped Bi2 WO6 superior photocatalyst and the regulation of superoxide and hydroxyl radicals［J］. Applied Surface Science, 2022, 592: 153311.

[23] [23] YAO X T, ZHEN H R, ZHANG D F, et al. Microwave-assisted hydrothermal synthesis of broadband Yb3+/Er3+ co-doped BiOI/Bi2O4 photocatalysts with synergistic effects of upconversion and direct Z-scheme heterojunction［J］. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2022, 648: 129276.

[24] [24] ALEXANDRU E, LUMINITA A. Photocatalytic activity of S-scheme heterostructure for hydrogen production and organic pollutant removal: a mini-review［J］. Nanomaterials, 2021, 11(4): 871.

[26] [26] WEI W, GONG H Y, SHENG L, et al. Highly efficient photocatalytic activity and mechanism of novel Er3+ and Tb3+ co-doped BiOBr/g-C3N5 towards sulfamethoxazole degradation［J］. Ceramics International, 2021, 47(17): 24062-24072.

[27] [27] ANWER H, PARK J W. Near-infrared to visible photon transition by upconverting NaYF4∶Yb3+, Gd3+, Tm3+@Bi2WO6 core@shell composite for bisphenol A degradation in solarlight ［J］. Applied Catalysis B: Environmental, 2019, 243: 438-447.

[28] [28] PUSHPENDRA, KUNCHALA R K, KALIA R, et al. Upconversion luminescence properties of NaBi(MoO4)2∶Ln3+, Yb3+(Ln=Er, Ho) nanomaterials synthesized at room temperature［J］. Ceramics International, 2020, 46: 18614-18622.

[29] [29] DUO S W, ZHONG C P, ZHANG J J, et al. Preparation of NaYF4∶Gd3+, Yb3+, Tm3+ @TiO2 and NaYF4∶Gd3+, Yb3+, Tm3+ @ TiO2@Au nanocomposites and their upconversion and photocatalytic properties under simulated solar light with or without an UV filter［J］. Journal of Materials Science: Materials in Electronics, 2018, 29(4): 2974-2987.

[30] [30] TIAN Q Y, YAO W J, WU W, et al. NIR light-activated upconversion semiconductor photocatalysts［J］. Nanoscale horizons, 2019, 4(1): 10-25.

[31] [31] MAVENGERE S, JUNG S C, KIM J S. Effect of coupling indium tin oxide with the TiO2-NaYF4∶(Gd, Si) composite for photocatalytic properties［J］. Journal of Nanoscience and Nanotechnology, 2020, 20(12): 7629-7635.

[33] [33] XIA J, WANG F L, ZHOU M, et al. Facile synthesis of VS2/CdS/NaYF4∶Yb, Er ternary heterojunctions for the visible-near-infrared-light driven photocatalysis［J］. Journal of Solid State Chemistry, 2023, 317(PA): 123583.

[35] [35] JAROSZ D A, O’CALLAGHAN P, KUNCEWICZ J, et al. Enhanced UV light emission by core-shell upconverting particles powering up TiO2 photocatalysis in near-infrared light［J］. Catalysts, 2020, 10(2): 232.

[36] [36] CHU R Y, LU J H, LI M C, et al. Pulsed Nd∶YAG laser irradiation injury threshold of chinese retinas［J］. Chinese Medical Journal, 1987(11): 859.

[40] [40] WANG D, WANG X, LIU J Z, et al. Preparation of high proportion of Z-scheme Er3+∶Y3Al5O12@Nb2O5/Pt/In2O3 composite for enhanced visible-light driven photocatalytic hydrogen production［J］. Materials Science and Engineering: B, 2020, 257: 114549.

[41] [41] LIU X, WANG X, LI H, et al. Microwave-assisted synthesis of ZnO-Y3Al5O12∶Ce3+ composites with enhanced visible light photocatalysis［J］. Journal of Materials Chemistry, 2012, 22(32): 16293.

[42] [42] ZAMMOURI L, ABOULAICH A, CAPOEN B, et al. Synthesis of YAG∶Ce/ZnO core/shell nanoparticles with enhanced UV-visible and visible light photocatalytic activity and application for the antibiotic removal from aqueous media［J］. Journal of Materials Research, 2019, 34(8): 1318-1330.

[43] [43] NEHED A, AUBRY M, AUDREY P, et al. Nanostructuration of YAG∶Ce coatings by ZnO nanowires: a smart way to enhance light extraction efficiency［J］. Nanomaterials, 2022, 12(15): 2568.

[44] [44] FENG C, TENG F, LIU Z, et al. A newly discovered BiF3 photocatalyst with a high positive valence band［J］. Journal of Molecular Catalysis. A, Chemical, 2015, 401: 35-40.

[45] [45] ZHANG C Y, FU Z D, HONG F, et al. Non-metal group doped g-C3N4 combining with BiF3∶Yb3+, Er3+ upconversion nanoparticles for photocatalysis in UV-Vis-NIR region［J］. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2021, 627: 127180.

[46] [46] BOJANA M, JOVANA P, ZORAN R, et al. Hydrothermal synthesis and properties of Yb3+/Tm3+ doped Sr2LaF7 upconversion nanoparticles［J］. Nanomaterials, 2022, 13(1)：30-30.

[47] [47] LI Y J, ZHANG Y Y, WANG J J, et al. Enhancement of solar-driven photocatalytic activity of oxygen vacancy-rich Bi/BiOBr/Sr2LaF7∶Yb3+, Er3+ composites through synergetic strategy of upconversion function and plasmonic effect［J］. Journal of Environmental Sciences, 2022, 115: 76-87.

[48] [48] YANG D, GUO Q, LIAO L, et al. Crystal structure and up-conversion luminescence properties of K3ScF6∶Er 3+, Yb3+cryolite［J］. Journal of Alloys and Compounds, 2020, 848: 156336.

[49] [49] YANG D, LIAO L, ZHANG Y, et al. Synthesis and up-conversion luminescence properties of a novel K3ScF6∶Yb3+, Tm3+ material with cryolite structure［J］. Journal of Luminescence, 2020, 224: 117285.