Novel solid state emitting iridium complexes with reduced phosphorescence-self-quenching triggered by steric blocking phosphine ligands

Jian, Yuan; Peng, Shuming; Li, Xingliang; Xu, Wen; He, Jiaheng; Jiang, Lin; Dang, Yufeng

doi:10.1016/j.ica.2010.12.035

Cited by 16 publications

(10 citation statements)

References 21 publications

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“…Structure of analogous derivative [Ir(ppy) 2 (PPh 3 )Cl] ( 7 ) was determined by single crystal X‐ray diffraction, and fabrication of POLED using a 10 : 4 w/w mixture of PVK and 2‐(4‐biphenylyl)‐5‐(4‐tert‐butylphenyl)‐1,3,4‐oxadiazole (PBD) as host and 16 wt.% of 7 afforded an max. EQE of 4.0 % at 3.3 mA/cm 2 and power efficiency of 0.86 lm/W at 11 V, for which the improvements were attributed to more balanced carrier transport and charge recombination at EML .…”

Section: Emitters Bearing Monodentate P Donormentioning

confidence: 99%

“…The best fabricated device with 6 and PVK host furnished maximum external quantum efficiency (h ext ) of 1.45 % and power efficiency (h p ) of 0.99 lm/W at 13 mA/cm 2 and at a doping concentration of 10 wt.%, respectively. [8] Structure of analogous derivative [Ir(ppy) 2 (PPh 3 )Cl] (7) was determined by single crystal X-ray diffraction, [9] and fabrication of POLED using a 10 : 4 w/w mixture of PVK and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as host and 16 wt.% of 7 afforded an max. EQE of 4.0 % at 3.3 mA/cm 2 and power efficiency of 0.86 lm/W at 11 V, for which the improvements were attributed to more balanced carrier transport and charge recombination at EML.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, a series of closely related Ir(III) derivatives with varied cyclometalating chelate and dual phosphines were synthesized using a two-step in one pot approach. [22] It involves heating of IrCl 3 · 3H 2 O and phosphine at 130 8C for 4-7 h, followed by addition of organic aromatics and continuous heating for another [3][4][5][6][7][8][9][10][11][12] h. An intermediate [Ir(PPh 2 C 6 H 4 )(PPh 3 ) 2 (Cl)H] (22) to this transformation is assigned to have the structure shown in Scheme 8.…”

Section: Introductionmentioning

confidence: 99%

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Emissive Iridium(III) Complexes with Phosphorous‐Containing Ancillary

Chi

Wang

Ganesan

2018

The Chemical Record

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Ir(III) metal complexes and related emitters bearing all kind of cyclometalated chromophoric chelates and non-chromophoric ancillary are extensively studied during the past three decades. Many of them have been found to display bright room temperature phosphorescence from triplet excited states in both solution and solid states, offering a possible application in contemporary optoelectronic technologies, including organic light emitting diodes, electrochemiluminescence, biological imaging and chemical sensing. Among reported materials, there are Ir(III) complexes with at least one phosphorus (P)-containing ligand and/or ancillary chelate, together with cyclometalates or equivalents that are in control of the actual emission energy. Particularly, possession of P-based donor can lead to divergent structural and photophysical properties compared to the traditional designs. This review aims to provide a literature overview as well as the authors' personal account to the development of relevant Ir(III) based phosphors bearing these P-donors. To the readers' convenience, the contents are subdivided into six sessions, according to whether or not they are charge natural, or with mono-or dianionic electronic character, and in accordance to their divergent bonding modes, i. e. monodentate, bidentate and tripodal coordination. In many cases, the P-based ancillaries offer an easy accessible route to the formation of efficient sky-blue and true-blue emitters due to their p-accepting property, together with enlarged emission energy gap and destabilized upper lying quenching state. . Emitters Bearing Monodentate P Donor Neutral Ir(III) metal complex [Ir(ppy) 2 (PBu n 3 )Cl] (5) depicted in Scheme 3, had been synthesized from treatment of dimer [Ir(ppy) 2 (m-Cl)] 2 with stoichiometric amount of P(n-Bu) 3 in CH 2 Cl 2 at RT. [8] It showed mixed 3 MLCT and pp* based emission profile with peak max. at 492 nm. Its emission is blue-shifted with respect to that of parent [Ir(ppy) 3 ], indicating the higher ligand field strength of phosphine and increased HOMO-LUMO energy gap. . His current research interests involve the design and evaluation of transition-metal based true-blue and NIR phosphors and thermally activated delay fluorescence materials for organic light emitting diodes (OLEDs). He has coauthored over 340 scientific articles with overall H-index > 61 and held over 50 patents worldwide. Scheme 1. Structural drawings of Os(II) complexes 1 and 2. Scheme 2. Structural drawings of Pt(II) complexes 3 and 4.

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Section: Emitters Bearing Monodentate P Donormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Emissive Iridium(III) Complexes with Phosphorous‐Containing Ancillary

Chi

Wang

Ganesan

2018

The Chemical Record

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“…O desempenho de emissão das amostras em estado sólido é frequentemente reduzido devido à processos de agregação e/ou pela baixa qualidade óptica da matriz em comparação com solventes orgânicos. 42,43,49,57,176,183 192,193 Essas observações sugerem que para comprimentos de onda mais curtos que 350 nm (3.54 eV) os estados excitados do complexo são desativados por processos de supressão da luminescência, via desativação por migração de éxcitons em matriz hospedeira com ambientes energeticamente difusos. 31,117,[194][195][196] Esses efeitos podem ser devidos à presença de superfície de grupos siloxil na matriz, defeitos ricos em oxigênio, matéria orgânica…”

Section: Estudo Das Propriedades Fotofísicas Do Complexo De Irídio(iiunclassified

“…1,14,[40][41][42][43] Este problema tem sido abordado através da dispersão destes emissores em matrizes poliméricas, 39,44,45 em argilas multicamadas, 46,47 ou por sol-gel, em processos de auto montagem de micro-e nano-partículas, 27,43,48,49 por dissolução no sol e posterior condensação do material híbrido, 1,43,50 por impregnação úmida em matrizes mesoporosas, [51][52][53][54] ou por processos de funcionalização da matriz e posterior ligação covalente do centro luminescente. 27,33,52,55 Alternativamente, pesquisadores têm se dedicado a modificar os grupos formadores dos corantes ou dos grupos substituintes dos ligantes dos complexos que atuam como espaçadores moleculares, 8,35,56,57 como agentes polimerizantes, 14,58 e/ou como grupos transportadores de carga. 59…”

Section: Introductionunclassified

Estudos espectroscópicos de sistemas luminescentes hóspede/hospedeiro

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Role of the Diphosphine Chelate in Emissive, Charge‐Neutral Iridium(III) Complexes

Liao

Devereux

Fox

et al. 2017

Chemistry A European J

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A class of neutral tris-bidentate Ir metal complexes incorporating a diphosphine as a chelate is prepared and characterized here for the first time. Treatment of [Ir(dppBz)(tht)Cl ] (1, dppBz=1,2-bis(diphenylphosphino)benzene, tht=tetrahydrothiophene) with fppzH (3-trifluoromethyl-5-(2'-pyridyl)-1H-pyrazole) afforded the dichloride complexes, trans-(Cl,Cl)[Ir(dppBz)(fppz)Cl ] (2) and cis-(Cl,Cl)[Ir(dppBz)(fppz)Cl ] (3). The reaction of 3 with the dianionic chelate precursor, 5,5'-di(trifluoromethyl)-3,3'-bipyrazole (bipzH ) or 5,5'-(1-methylethylidene)-bis(3-trifluoromethyl-1H-pyrazole) (mepzH ), in DMF gave the tris-bidentate complex [Ir(dppBz)(fppz)(bipz)] (4) or [Ir(dppBz)(fppz)(mepz)] (5), respectively. In contrast, a hydride complex [Ir(dppBz)(fppz)(bipzH)H] (6) was isolated instead of 4 in protic solvent, namely: diethylene glycol monomethyl ether (DGME). All complexes 2-6 are luminescent in powder form and thin films where the dichlorides (2, 3) emit with maxima at 590-627 nm (orange) and quantum yields (QYs) up to 90 % whereas the tris-bidentate (4, 5) and hydride (6) complexes emit at 455-458 nm (blue) with QYs up to 70 %. Hybrid (time-dependent) DFT calculations showed considerable metal-to-ligand charge transfer contribution to the orange-emitting 2 and 3 but substantial ligand-centered π-π* transition character in the blue-emitting 4-6. The dppBz does not participate in the radiative transitions in 4-6, but it provides the rigidity and steric bulk needed to promote the luminescence by suppressing the self-quenching in the solid state. Fabrication of an organic light-emitting diode (OLED) with dopant 5 gave a deep-blue CIE chromaticity of (0.16, 0.15). Superior blue emitters, which are vital in OLED applications, may be found in other neutral Ir complexes containing phosphine chelates.

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Novel solid state emitting iridium complexes with reduced phosphorescence-self-quenching triggered by steric blocking phosphine ligands

Cited by 16 publications

References 21 publications

Emissive Iridium(III) Complexes with Phosphorous‐Containing Ancillary

Emissive Iridium(III) Complexes with Phosphorous‐Containing Ancillary

Estudos espectroscópicos de sistemas luminescentes hóspede/hospedeiro

Role of the Diphosphine Chelate in Emissive, Charge‐Neutral Iridium(III) Complexes

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