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Abstract
A new homodinuclear complex [Eu(btfa)3]2bpm (1) was synthesized incorporating 4,4,4-trifluoro-1-phenyl-1,3-butanedione (btfa) as the primary and 2,2′-bipyrimidine (bpm) as the auxiliary ligand. The complex was characterized by analytical and spectroscopic techniques, with special emphasis on the crystal structure and photoluminescence (PL) properties, both experimentally and theoretically. Single crystal X-ray diffraction (SCXRD) analysis reveals that the two Eu(iii) ions in 1 are eight coordinate, where the bpm behaves as a N4 donor linking the two Eu(iii) ions symmetrically. Each Eu(iii) ion displays a distorted square antiprismatic (DSAP, D4d) coordination geometry. Complex 1 displayed bright red emission with (CIE)x,y color coordinates = 0.670; 0.330 and an absolute photoluminescence quantum yield (PLQY) of 54.4%. The theoretical intensity parameters (Ω2 and Ω4), radiative (AR) and non-radiative (ANR) decay rates, intrinsic quantum yield (QEuEu), sensitization efficiency (ηsen) and PLQY were assessed using the LUMPAC software and showed very good agreement with the experimental values. Based on these, an energy transfer (ET) mechanism is proposed and discussed. Moreover, 1 was used as an emitter to fabricate single- A nd double-emitting layer (EML) red-emitting electroluminescent devices. Double-EML device at the optimum doping concentration of 4.0 wt% displayed impressive EL performances, brightness (B) = 812 cd m-2, maximum current efficiency (ηc) = 3.97 cd A-1, maximum power efficiency (ηp) = 3.89 lm W-1, and external quantum efficiency (EQE) = 2.8% at very low Vturn-on = 3.2 V with (CIE)x,y = 0.662, 0.321 which is close to the standard red color recommended by NTSC (0.67, 0.33).
Original language | English |
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Pages (from-to) | 9816-9827 |
Number of pages | 12 |
Journal | Journal of Materials Chemistry C |
Volume | 8 |
Issue number | 29 |
DOIs | |
Publication status | Published - 7 Aug 2020 |
Funding
MSK acknowledges His Majesty’s Trust Fund for Strategic Research (Grant No. SR/SQU/SCI/CHEM/16/02) for funding. RI thanks HM’s Trust Fund for a postdoctoral fellowship. WYW thanks the Hong Kong Research Grants Council (PolyU 153058/ 19P), Hong Kong Polytechnic University (1-ZE1C) and the Endowed Professorship in Energy from Ms Clarea Au (847S) for the financial support. LZ is grateful to the financial aid from National Natural Science Foundation of China (21771172), Youth Innovation Promotion Association of Chinese Academy of Sciences (2013150). PCQ thanks the Foundation of Wenzhou Science & Technology Bureau (No. W20170003) and the National Natrual Science Foundation of China (No. 21828102). PRR is grateful to the Engineering and Physical Sciences Research Council (EPSRC) for continued funding (Grant EP/K004956/1).
ASJC Scopus subject areas
- General Chemistry
- Materials Chemistry
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Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly
Raithby, P. (PI), Burrows, A. (CoI), Lewis, D. (CoI), Marken, F. (CoI), Parker, S. (CoI), Walsh, A. (CoI) & Wilson, C. (CoI)
Engineering and Physical Sciences Research Council
1/11/12 → 30/04/18
Project: Research council