[1] [1] FAN C, YANG C L. Yellow/orange emissive heavy-metal complexes as phosphors in monochromatic and white organic light-emitting devices [J].Chem. Soc. Rev., 2014, 43(17): 6439-6469.

[2] [2] WU Z B, LUO J J, SUN N, et al. High-performance hybrid white organic light-emitting diodes with superior efficiency/color rendering index/color stability and low efficiency roll-off based on a blue thermally activated delayed fluorescent emitter [J]. Adv. Funct. Mater., 2016, 26(19): 3306-3313.

[4] [4] YAM V W Y, AU V K M, LEUNG S Y L. Light-emitting self-assembled materials based on d8 and d10 transition metal complexes [J]. Chem. Rev., 2015, 115(15): 7589-7728.

[6] [6] LIU Y C, LI C S, REN Z J, et al. All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes [J]. Nat. Rev. Mater., 2018, 3(4): 18020.

[7] [7] LAI S L, TAO S L, CHAN M Y, et al. Iridium(Ⅲ) bis[2-(2-naphthyl)pyridine] (acetylacetonate)-based yellow and white phosphorescent organic light-emitting devices [J]. J. Mater. Chem., 2011, 21(13): 4983-4988.

[8] [8] ZHANG Z S, YUE S Z, WU Y K, et al. Low driving voltage blue, green, yellow, red and white organic light-emitting diodes with a simply double light-emitting structure [J]. Opt. Express, 2014, 22(2): 1815-1823.

[9] [9] CHANG Y L, KAMINO B A, WANG Z B, et al. Highly efficient greenish-yellow phosphorescent organic light-emitting diodes based on interzone exciton transfer [J]. Adv. Funct. Mater., 2013, 23(25): 3204-3211.

[10] [10] ZHANG B H, TAN G P, LAM C S, et al. High-efficiency single emissive layer white organic light-emitting diodes based on solution-processed dendritic host and new orange-emitting iridium complex [J]. Adv. Mater., 2012, 24(14): 1873-1877.

[11] [11] DUMUR F, LEPELTIER M, SIBONI H Z, et al. Highly efficient organic light-emitting devices prepared with a phosphorescent heteroleptic iridium (Ⅲ) complex containing 7,8-benzoquinoline as the cyclometalated ligand [J]. Adv. Opt. Mater., 2014, 2(3): 262-266.

[12] [12] TAO P, LI W L, ZHANG J, et al. Facile synthesis of highly efficient lepidine-based phosphorescent iridium(Ⅲ) complexes for yellow and white organic light-emitting diodes [J]. Adv. Funct. Mater., 2016, 26(6): 881-894.

[13] [13] BARANOFF E, CURCHOD B F E. FIrpic: archetypal blue phosphorescent emitter for electroluminescence[J]. Dalton Trans., 2015, 44(18): 8318-8329.

[14] [14] TAO P, ZHANG Y B, WANG J, et al. Highly efficient blue phosphorescent iridium(Ⅲ) complexes with various ancillary ligands for partially solution-processed organic light-emitting diodes [J]. J. Mater. Chem. C, 2017, 5(36): 9306-9314.

[15] [15] ZHENG Y H, BATSANOV A S, EDKINS R M, et al. Thermally induced defluorination during a mer to fac transformation of a blue-green phosphorescent cyclometalated iridium(Ⅲ) complex [J]. Inorg. Chem., 2012, 51(1): 290-297.

[16] [16] SIVASUBRAMANIAM V, BRODKORB F, HANNING S, et al. Fluorine cleavage of the light blue heteroleptic triplet emitter FIrpic [J]. J. Fluorine Chem., 2009, 130(7): 640-649.