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To circumvent this obstacle, a series of Ir(III)\u2010based carbene complexes bearing asymmetric di\u2010\n                    <jats:italic>N<\/jats:italic>\n                    \u2010aryl 6\u2010(trifluoromethyl)\u2010\n                    <jats:italic>2H<\/jats:italic>\n                    \u2010imidazo[4,5\u2010b]pyridin\u20102\u2010ylidene chelates, namely,\n                    <jats:bold>\n                      <jats:italic>f<\/jats:italic>\n                      \u2010ct6a\u2012c\n                    <\/jats:bold>\n                    , are synthesized, and their structures and photophysical properties are comprehensively investigated. Moreover, these emitters can undergo interconversion in refluxing 1,2,4\u2010trichlorobenzene, catalyzed by a mixture of sodium acetate (NaOAc) and\n                    <jats:italic>p<\/jats:italic>\n                    \u2010toluenesulfonic acid monohydrate (TsOH\u00b7H\n                    <jats:sub>2<\/jats:sub>\n                    O) without decomposition. All Ir(III) complexes present good photoluminescence quantum yield (\n                    <jats:italic>\u03a6<\/jats:italic>\n                    <jats:sub>PL<\/jats:sub>\n                    = 83\u201388%) with peak maximum (max.) at 443\u2013452\u00a0nm and narrowed full width at half maximum (FWHM = 66\u201373\u00a0nm). Among all the fabricated OLED devices,\n                    <jats:bold>\n                      <jats:italic>f<\/jats:italic>\n                      \u2010ct6b\n                    <\/jats:bold>\n                    delivers a max. external quantum efficiency (EQE) of 23.4% and Commission Internationale de L'Eclairage CIE\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>,<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    coordinates of (0.14, 0.12), whereas the hyper\u2010OLED device based on\n                    <jats:bold>\n                      <jats:italic>f<\/jats:italic>\n                      \u2010ct6a\n                    <\/jats:bold>\n                    and 5H,9H,11H,15H\u2010[1,4] benzazaborino [2,3,4\u2010kl][1,4]benzazaborino[4\u2032,3\u2032,2\u2032:4,5][1,4]benzazaborino[3,2\u2010b]phenazaborine\u20107,13\u2010diamine, N7,N7,N13,N13,5,9,11,15\u2010octaphenyl (\u03bd\u2010DABNA) exhibits max. EQE of 26.2% and CIE\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>,<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    of (0.12, 0.13). Finally, the corresponding tandem OLED with\n                    <jats:bold>\n                      <jats:italic>f<\/jats:italic>\n                      \u2010ct6b\n                    <\/jats:bold>\n                    as dopant gives a max. luminance of over 10\u00a0000 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    and max. EQE of 42.1%, confirming their candidacies for making true\u2010blue OLEDs.\n                  <\/jats:p>","DOI":"10.1002\/adma.202305273","type":"journal-article","created":{"date-parts":[[2023,7,18]],"date-time":"2023-07-18T02:48:11Z","timestamp":1689648491000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Blue Electrophosphorescence from Iridium(III) Phosphors Bearing Asymmetric Di\u2010\n                    <i>N<\/i>\n                    \u2010aryl 6\u2010(trifluoromethyl)\u20102\n                    <i>H<\/i>\n                    \u2010imidazo[4,5\u2010b]pyridin\u20102\u2010ylidene Chelates"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8305-5749","authenticated-orcid":false,"given":"Jie","family":"Yan","sequence":"first","affiliation":[{"name":"Department of Materials Sciences and Engineering City University of Hong Kong  Hong Kong Hong Kong SAR 999077 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