[1] JUDD B R. Optical absorption intensities of rare-earth ions[D]. Phys. Rev., 127, 750-761(1962).

[2] OFELT G S. Intensities of crystal spectra of rare-earth ions[D]. J. Chem. Phys., 37, 511-520(1962).

[3] WALSH B M. Judd-Ofelt theory: principles and practices, advances in spectroscopy for laser and sensing[D]. NATO Science series, Series II: Mathematics, Physics and Chemistry, 231, 403-433(2006).

[4] BRIK M G, HEHLEN M P, KRAMER K W. 50^th anniversary of the Judd-Ofelt theory: an experimentalist’s view of the formalism and its application[D]. J. Lumin., 136, 221-239(2013).

[5] PEACOCK R D. The intensities of lanthanide f ↔ f transitions[D]. Struct. Bond. Berlin, 22, 83-122(1975).

[6] BABU P, JAYASANKAR C K. Spectroscopy of Pr³+ ions in lithium borate and lithium fluoroborate glasses[D]. Physica B, 301, 326-340(2011).

[7] , GENOVA R T, MARTIN I R. Optical intensities of Pr³+ ions in transparent oxyfluoride glass and glass-ceramic. applications of the standard and modified Judd-Ofelt theories.[D]. J. Alloys Compd., 380, 167-172(2004).

[8] LIU F, LU S Z, ZHANG J H. Explicit effects of 4f 5d configuration on 4f ²®4f ² electric dipole transitions in Pr³+-doped SrAl₁₂O₁₉[D]. Phys. Rev. B, 74(2006).

[9] FLOREZ A, FLOREZ M, MESSADDEQ Y. Application of standard and modified Judd-Ofelt theories to thulium doped fluoroindate glass[D]. J. Non-Cryst. Solids, 247, 215-221(1999).

[10] MINISCALCO W J, QUIMBY R S. Modified Judd-Ofelt technique and application to optical transitions in Pr³+-doped glass[D]. J. Appl. Phys., 75, 613-615(1994).

[11] BARNES N P, BARTOLO B D, WALSH B M. Branching ratios, cross sections, and radiative lifetimes of rare earth ions in solids: application to Tm³+ and Ho³+ ions in LiYF₄[D]. J. Appl. Phys., 83, 2772-2787(1998).

[12] CHEN B J, ZHENG Y F, ZHONG H Y. Optical transition, excitation state absorption, and energy transfer study of Er³+, Nd³+ single-doped, and Er³+/Nd³+ codoped tellurite glasses for mid- infrared laser applications[D]. J. Am. Ceram. Soc., 94, 1766-1772(2011).

[13] RAMAKRISHNA J, SAISUDHA M B. Effect of host glass on the optical absorption properties of Nd³+, Sm³+, and Dy³+ in lead borate glasses[D]. Phys. Rev. B, 53, 6186-6196(1996).

[14] CHEN BJ, YANG Y M, YAO B Q. Judd-Ofelt analysis of spectroscopic properties of Tm³+, Ho³+ doped GdVO₄ crystals[D]. Opt. Mater., 29, 1159-1165(2007).

[15] CHEN X Y, LIU L Q. Energy levels, fluorescence lifetime and Judd-Ofelt parameters of Eu³+ in Gd₂O₃ nanocrystals[D]. Nanotechnology, 18, 255704(2007).

[16] LI R F, LIAO J S, LUO W Q. Determination of Judd-Ofelt intensity parameters from the excitation spectra for rare-earth doped luminescent materials[D]. Phys. Chem. Chem. Phys., 12, 3276-3282(2010).

[17] CHEN B J, TIAN Y, TIAN B N. Excitation pathway and temperature dependent luminescence in color tunable Ba₅Gd₈Zn₄O₂₁:Eu³+ phosphors[D]. J. Mater. Chem. C, 1, 2338-2344(2013).

[18] KROOM R E, PATHAK T K, SWART H C. Influence of Bi doping on the structure and photoluminescence of ZnO phosphor synthesized by the combustion method[D]. Spectroschim. Acta A, 190, 164-171(2018).

[19] KORTUM G. Reflectance Spectroscopy: Principles, Methods, Applications, Translated from the German by[D]. J. E. Lohr. Springer-Verlag New York Inc(1969).

[20] CHEN B J, TIAN Y, YU H Q. Controllable synthesis and luminescent properties of three-dimensional nanostructured CaWO₄:Tb³+ microspheres[D]. J. Colloid Interf. Sci., 360, 586-592(2011).

[21] BOYER J C, CAPOBIANCO J A, VETRONE F. NIR to visible upconversion in nanocrystalline and bulk Lu₂O₃:Er³+[D]. J. Phys. Chem. B, 106, 5622-5628(2002).