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The effects of CF<jats:sub>3<\/jats:sub> substitution on their structure as well as their electrochemical and photophysical properties are also presented. The HOMO\u2013LUMO gap was tuned by the N^N ligand; the largest redshift in the metal\u2010to\u2010ligand charge transfer (MLCT) band was for [Cu(P^P){5,5\u2032\u2010(CF<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub>bpy}][PF<jats:sub>6<\/jats:sub>]. In solution, the compounds are weak yellow to red emitters. The emission properties depend on the substitution pattern, but this cannot be explained by simple electronic arguments. Among powders, [Cu(xantphos){4,4\u2032\u2010(CF<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub>bpy}][PF<jats:sub>6<\/jats:sub>] has the highest photoluminescence quantum yield (PLQY; 50.3\u2009%) with an emission lifetime of 12\u2005\u03bcs. Compared to 298\u2005K solution behavior, excited\u2010state lifetimes became longer in frozen Me\u2010THF (77\u2005K; THF=tetrahydrofuran), thus indicating thermally activated delayed fluorescence (TADF). Time\u2010dependent (TD)\u2010DFT calculations show that the energy gap between the lowest\u2010energy singlet and triplet excited states (0.12\u20130.20\u2005eV) permits TADF. Light\u2010emitting electrochemical cells (LECs) with [Cu(POP)+(6\u2010CF<jats:sub>3<\/jats:sub>bpy)][PF<jats:sub>6<\/jats:sub>], [Cu(xantphos)(6\u2010CF<jats:sub>3<\/jats:sub>bpy)][PF<jats:sub>6<\/jats:sub>], or [Cu(xantphos){6,6\u2032\u2010Me<jats:sub>2<\/jats:sub>\u20104,4\u2032\u2010(CF<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub>bpy}][PF<jats:sub>6<\/jats:sub>] emit yellow electroluminescence. The LEC with [Cu(xantphos){6,6\u2032\u2010Me<jats:sub>2<\/jats:sub>\u20104,4\u2032\u2010(CF<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub>bpy}][PF<jats:sub>6<\/jats:sub>] had the fastest turn\u2010on time (8\u2005min), and the LEC with the longest lifetime (<jats:italic>t<\/jats:italic><jats:sub>1\/2<\/jats:sub>=31\u2005h) contained [Cu(xantphos)(6\u2010CF<jats:sub>3<\/jats:sub>bpy)][PF<jats:sub>6<\/jats:sub>]; these LECs reached maximum luminances of 131 and 109\u2005cd\u2009m<jats:sup>\u22122<\/jats:sup>, respectively.<\/jats:p>","DOI":"10.1002\/cplu.201700501","type":"journal-article","created":{"date-parts":[[2018,1,10]],"date-time":"2018-01-10T07:31:10Z","timestamp":1515569470000},"page":"217-229","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["CF<sub>3<\/sub> Substitution of [Cu(P^P)(bpy)][PF<sub>6<\/sub>] Complexes: Effects on Photophysical Properties and Light\u2010Emitting Electrochemical Cell Performance"],"prefix":"10.1002","volume":"83","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8641-5562","authenticated-orcid":false,"given":"Sarah","family":"Keller","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Basel, BPR 1096  Mattenstrasse 24a 4058 Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7536-2223","authenticated-orcid":false,"given":"Fabian","family":"Brunner","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Basel, BPR 1096  Mattenstrasse 24a 4058 Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 M.","family":"Junquera\u2010Hern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Instituto de Ciencia Molecular Universidad de Valencia  45980 Paterna, Valencia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Perteg\u00e1s","sequence":"additional","affiliation":[{"name":"Instituto de Ciencia Molecular Universidad de Valencia  45980 Paterna, Valencia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria\u2010Grazia","family":"La\u2010Placa","sequence":"additional","affiliation":[{"name":"Instituto de Ciencia Molecular Universidad de Valencia  45980 Paterna, Valencia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandro","family":"Prescimone","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Basel, BPR 1096  Mattenstrasse 24a 4058 Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4916-4041","authenticated-orcid":false,"given":"Edwin C.","family":"Constable","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Basel, BPR 1096  Mattenstrasse 24a 4058 Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9784-6253","authenticated-orcid":false,"given":"Henk J.","family":"Bolink","sequence":"additional","affiliation":[{"name":"Instituto de Ciencia Molecular Universidad de Valencia  45980 Paterna, Valencia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9544-8286","authenticated-orcid":false,"given":"Enrique","family":"Ort\u00ed","sequence":"additional","affiliation":[{"name":"Instituto de Ciencia Molecular Universidad de Valencia  45980 Paterna, Valencia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8074-0089","authenticated-orcid":false,"given":"Catherine E.","family":"Housecroft","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Basel, BPR 1096  Mattenstrasse 24a 4058 Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2018,2,5]]},"reference":[{"key":"e_1_2_6_1_1","volume-title":"Principles and Applications of Organic Light Emitting Diodes (OLEDs)","author":"Kalyani N. 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