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In this contribution, we report a series of blue\u2010emitting, bis\u2010tridentate Ir<jats:sup>III<\/jats:sup> complexes bearing chelates with two fused five\u2010six\u2010membered metallacycles, which are in sharp contrast to the traditional designs of tridentate chelates that form the alternative, fused five\u2010five metallacycles. Five Ir<jats:sup>III<\/jats:sup> complexes, <jats:bold>Px\u201021<\/jats:bold>\u2013<jats:bold>23<\/jats:bold>, <jats:bold>Cz\u20104<\/jats:bold>, and <jats:bold>Cz\u20105<\/jats:bold>, have been synthesized that contain a coordinated dicarbene pincer chelate incorporating a methylene spacer and a dianionic chromophoric chelate possessing either a phenoxy or carbazolyl appendage to tune the coordination arrangement. All these tridentate chelates afford peripheral ligand\u2013metal\u2013ligand bite angles of 166\u2013170\u00b0, which are larger than the typical bite angle of 153\u2013155\u00b0 observed for their five\u2010five\u2010coordinated tridentate counterparts, thereby leading to reduced geometrical distortion in the octahedral frameworks. Photophysical measurements and TD\u2010DFT studies verified the inherent transition characteristics that give rise to high emission efficiency, and photodegradation experiments confirmed the improved stability in comparison with the benchmark <jats:italic>fac<\/jats:italic>\u2010[Ir(ppy)<jats:sub>3<\/jats:sub>] in degassed toluene at room temperature. Phosphorescent OLED devices were also fabricated, among which the carbazolyl\u2010functionalized emitter <jats:bold>Cz\u20105<\/jats:bold> exhibited the best performance among all the studied bis\u2010tridentate phosphors, showing a maximum external quantum efficiency (EQE<jats:sub>max<\/jats:sub>) of 18.7\u2009% and CIE<jats:sub><jats:italic>x<\/jats:italic>,<jats:italic>y<\/jats:italic><\/jats:sub> coordinates of (0.145, 0.218), with a slightly reduced EQE of 13.7\u2009% at 100\u2005cd\u2009m<jats:sup>\u22122<\/jats:sup> due to efficiency roll\u2010off.<\/jats:p>","DOI":"10.1002\/chem.201903707","type":"journal-article","created":{"date-parts":[[2019,10,1]],"date-time":"2019-10-01T07:34:36Z","timestamp":1569915276000},"page":"15375-15386","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Bis\u2010tridentate Ir<sup>III<\/sup> Phosphors Bearing Two Fused Five\u2010Six\u2010Membered Metallacycles: A Strategy to Improved Photostability of Blue Emitters"],"prefix":"10.1002","volume":"25","author":[{"given":"Ling\u2010Yang","family":"Hsu","sequence":"first","affiliation":[{"name":"Department of Chemistry and Frontier Research Center on, Fundamental and Applied Sciences of Matter National Tsing Hua University  Hsinchu 30013 Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiumin","family":"Liang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices, and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology  Guangzhou 510640 P.R. 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