Blue Phosphorescence and Hyperluminescence Generated from Imidazo[4,5-b]pyridin-2-ylidene-Based Iridium(III) Phosphors
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 2201150 |
Journal / Publication | Advanced Science |
Volume | 9 |
Issue number | 25 |
Online published | 13 Jul 2022 |
Publication status | Published - 5 Sept 2022 |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85134012449&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(4604c961-26fb-4163-a874-6957fa15e13a).html |
Abstract
Four isomeric, homoleptic iridium(III) metal complexes bearing 5-(trifluoromethyl)imidazo[4,5-b]pyridin-2-ylidene and 6-(trifluoromethyl)imidazo[4,5-b]pyridin-2-ylidene-based cyclometalating chelates are successfully synthesized. The meridional isomers can be converted to facial isomers through acid induced isomerization. The m-isomers display a relatively broadened and red-shifted emission, while ƒ-isomers exhibit narrowed blue emission band, together with higher photoluminescent quantum yields and reduced radiative lifetime relative to the mer-counterparts. Maximum external quantum efficiencies of 13.5% and 22.8% are achieved for the electrophosphorescent devices based on ƒ-tpb1 and m-tpb1 as dopant emitter together with CIE coordinates of (0.15, 0.23) and (0.22, 0.45), respectively. By using ƒ-tpb1 as the sensitizing phosphor and t-DABNA as thermally activated delayed fluorescence (TADF) terminal emitter, hyperluminescent OLEDs are successfully fabricated, giving high efficiency of 29.6%, full width at half maximum (FWHM) of 30 nm, and CIE coordinates of (0.13, 0.11), confirming the efficient Förster resonance energy transfer (FRET) process.
Research Area(s)
- carbene, cyclometalate, hyperphosphorescence, iridium, organic light-emitting diode
Citation Format(s)
Blue Phosphorescence and Hyperluminescence Generated from Imidazo[4,5-b]pyridin-2-ylidene-Based Iridium(III) Phosphors. / Yang, Xilin; Zhou, Xiuwen; Zhang, Ye-Xin et al.
In: Advanced Science, Vol. 9, No. 25, 2201150, 05.09.2022.
In: Advanced Science, Vol. 9, No. 25, 2201150, 05.09.2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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