+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Roles of Ancillary Chelates and Overall Charges of Bis-Tridentate Ir(III) Phosphors for OLED Applications



Roles of Ancillary Chelates and Overall Charges of Bis-Tridentate Ir(III) Phosphors for OLED Applications



Acs Applied Materials and Interfaces 2019:



A series of charge-neutral bis-tridentate Ir(III) complexes (1, 3 and 4) were prepared via employing three distinctive tridentate pro-chelates, i.e., (pzptBphFO)H2, [(phpyim)H2·(PF6)] and [(pimb)H3·(PF6)2], which possess one dianionic, tridentate pzptBphFO, together with a second monoanionic chelate, namely: (pzptBphFO)H, phpyim, and pimb, while complex 2 with monoanionic chelate (pzptBphFO)Me was obtained by methylation of (pzptBphFO)H of 1 in basic media. Moreover, the closely related cationic complexes 5 - 7 were obtained by further methylation of remaining pyrazolate unit of neutral complexes 2 - 4, followed by anion metatheses. All of these Ir(III) metal complexes showed broadened emission profile with an onset at ∽450 nm, a result of enlarged ligand-centered ππ* transition gap, but with distinct efficiencies ranging from 0.8% to nearly unitary in CH2Cl2 solution at RT. Comprehensive spectroscopic as well as computational approaches were executed, providing a correlation for the emission efficiencies versus energy gaps between the metal-to-ligand charge transfer (MLCT)/ππ* emitting excited state and upper lying metal-centered dd quenching state. Furthermore, Ir(III) complexes 3 and 4 were selected as dopant emitters in fabrication of sky-blue phosphorescent OLEDs, affording max. external quantum efficiencies of 16.7% and 14.6% and with CIEx,y coordinates of (0.214, 0.454) and (0.191, 0.404) at current density of 102 cd/m2, respectively. Hence, this research highlights an inherent character of bis-tridentate Ir(III) complexes in achieving high phosphorescence quantum yield at molecular level.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 069604220

Download citation: RISBibTeXText

PMID: 31825583


Related references

Pt(II) Phosphors Featuring Both Dicarbene and Functional Biazolate Chelates: Synthesis, Luminescent Properties, and Applications in Organic Light-Emitting Diodes. Inorganic Chemistry 55(13): 6394-6404, 2016

Dinuclear chelates of acyclic and cyclic tridentate Schiff bases derived from sterically hinderedo-aminophenols. A new type of reactivity of tridentate ligands under electrosynthesis conditions. Russian Chemical Bulletin 58(7): 1383-1391, 2009

Novel Br-DPQ blue light-emitting phosphors for OLED. Luminescence 30(4): 405-410, 2015

Triphenylamine-dendronized pure red iridium phosphors with superior OLED efficiency/color purity trade-offs. Angewandte Chemie 46(7): 1149-1151, 2007

Ultra-high-resolution 1058-ppi OLED displays with 2.78-in size using CAAC-IGZO FETs with tandem OLED device and single OLED device. Journal of the Society for Information Display 24(3): 159-167, 2016

Tetraphenylborate salts of some tridentate chelates of nickel(II). Inorganica Chimica Acta 129(2): 149-152, 1987

Pentacoordinated Ni(bidentate)(tridentate) chelates and their hydrates. Inorganica Chimica Acta 8: 261-266, 1974

Bis-Tridentate Iridium(III) Phosphors with Very High Photostability and Fabrication of Blue-Emitting OLEDs. Advanced Science 5(9): 1800846, 2018

Metal chelates of rare earths: I. Composition, stability, and analytical applications of Alizarin Red S chelates of scandium and yttrium. Microchemical Journal 7(4): 473-484, 1963

Bis-Tridentate Ir(III) Metal Phosphors for Efficient Deep-Blue Organic Light-Emitting Diodes. Advanced Materials 29(33):, 2017

Ruthenium(II) sensitizers with heteroleptic tridentate chelates for dye-sensitized solar cells. Angewandte Chemie 50(9): 2054-2058, 2011

Blue-emitting Ir(III) phosphors with ancillary 4,6-difluorobenzyl diphenylphosphine based cyclometalate. Dalton Transactions 2009(33): 6472-6475, 2009

Direct electrochemical synthesis of novel transition metal chelates of tridentate azomethinic ligands. Polyhedron 18(7): 985-988, 1999

Syntheses, characterisation and structure of new diazoketiminato chelates of palladium(II) incorporating a tridentate (N,N,N) azo ligand. Polyhedron 25(13): 2637-2642, 2006

Radiopharmaceutical models incorporating the 3+1 core with tridentate chelates linked to bioactive molecules. Journal of Nuclear Medicine 44(5 Suppl.): 304P, 2003