دورية أكاديمية
Bulky iridium NHC complexes for bright, efficient deep-blue OLEDs
| العنوان: | Bulky iridium NHC complexes for bright, efficient deep-blue OLEDs |
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| المؤلفون: | Mackenzie, Campbell F. R., Zhang, Le, Cordes, David B., Slawin, Alexandra M. Z., Samuel, Ifor D. W., Zysman-Colman, Eli |
| المساهمون: | EPSRC, The Royal Society, University of St Andrews. School of Chemistry, University of St Andrews. School of Physics and Astronomy, University of St Andrews. EaSTCHEM, University of St Andrews. Centre for Biophotonics, University of St Andrews. Condensed Matter Physics, University of St Andrews. Centre for Energy Ethics |
| سنة النشر: | 2022 |
| المجموعة: | University of St Andrews: Digital Research Repository |
| مصطلحات موضوعية: | Blue emission, Iridium, NHC ligands, Organic light-emitting diodes, QD Chemistry, DAS, MCC, QD |
| الوصف: | Funding: C.F.R.M. and L.Z. contributed equally to this work. The authors thank the University of St Andrews and EPSRC for financial support (grants EP/P010482/1 and EP/M02105X/1, EP/K503940/1). The authors thank Umicore AG for the gift of materials. E.Z.-C. was a Royal Society Leverhulme Trust Senior Research fellow (SRF\R1\201089). ; Four new deep-blue-emitting iridium(III) NHC complexes containing sterically demanding ligands are synthesized. The four complexes show bright, deep-blue emission, with emission maxima between 420 and 427 nm in both acetonitrile solution and 30 wt% doped films in TSPO1; the two meridional isomers showing photoluminescence quantum yields, ΦPL, in doped films of 80% and 89%. The two meridional isomers are used to assess the impact of emitters containing bulky, sterically demanding ligands on the performance of organic light-emitting diodes (OLEDs). OLEDs employing a stepped doping profile with mer-Ir(tfpi_tmBn)3 as the emitter produce the highest performing devices in this study, with these devices exhibiting deep-blue [λEL = 429 nm, CIE = (0.16, 0.08)] emission and a maximum external quantum efficiency (EQEmax) of 14.9%, which decreases to 11.7% at 100 cd m−2. The performance of the OLEDs shows very good efficiencies and moderate efficiency roll-offs in comparison to reported phosphorescent deep-blue OLEDs with CIEy ≤ 0.08, as required for commercial displays. The promising results suggest that the design strategy of adding steric bulk to blue emitting iridium complexes containing NHC ligands is a useful strategy for reducing intermolecular interactions between emitters in OLEDs. ; Publisher PDF ; Peer reviewed |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| ردمك: | 978-0-00-891669-5 0-00-891669-1 |
| تدمد: | 2195-1071 |
| العلاقة: | Advanced Optical Materials; Mackenzie , C F R , Zhang , L , Cordes , D B , Slawin , A M Z , Samuel , I D W & Zysman-Colman , E 2023 , ' Bulky iridium NHC complexes for bright, efficient deep-blue OLEDs ' , Advanced Optical Materials , vol. 11 , no. 2 , 2201495 . https://doi.org/10.1002/adom.202201495Test; PURE: 281863268; PURE UUID: 6fe001d4-f994-4a30-acd3-e07a92b5be68; ORCID: /0000-0002-9527-6418/work/124078724; ORCID: /0000-0002-5366-9168/work/124078867; ORCID: /0000-0001-7183-6022/work/124079186; Scopus: 85143401094; WOS: 000891669100001; http://hdl.handle.net/10023/26503Test; https://doi.org/10.1002/adom.202201495Test; https://doi.org/10.26434/chemrxiv-2022-gwf1rTest; EP/P010482/1; EP/M02105X/1; EP/K503940/1; SRF\R1\201089 |
| DOI: | 10.1002/adom.202201495 |
| DOI: | 10.26434/chemrxiv-2022-gwf1r |
| الإتاحة: | https://doi.org/10.1002/adom.202201495Test https://doi.org/10.26434/chemrxiv-2022-gwf1rTest http://hdl.handle.net/10023/26503Test |
| حقوق: | Copyright © 2022 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| رقم الانضمام: | edsbas.AC88792C |
| قاعدة البيانات: | BASE |
| ردمك: | 9780008916695 0008916691 |
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| تدمد: | 21951071 |
| DOI: | 10.1002/adom.202201495 |