Solid-State White Light-Emitting Electrochemical Cells Using Iridium-Based Cationic Transition Metal Complexes

Su, Hai‐Ching; Chen, Hsiao-Fan; Fang, Fu Chuan; Liu, Chih Che; Wu, Chung Chih; Wong, Ken‐Tsung; Liu, Yi Hung; Peng, Shie‐Ming

doi:10.1021/ja076051e

Cited by 262 publications

(134 citation statements)

References 35 publications

(25 reference statements)

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“…Soon after this result, the same authors used this approach to prepare the first white LEC, which is described in Section 4.4.4.5. [159] Recently, they utilized complex 37 (Figure 27) as the host for a fluorescent cationic dye (Rhodamine 6G) achieving high EQE and power efficiency values of 5.5 % and 21.3 lm W À1 respectively, using a low dye doping (0.10 wt %). [187] Recently, the same group investigated the electroluminescence properties of a cationic terfluorene derivative (Figure 28), obtaining a deep-blue-emitting LEC.…”

Section: Diluting An Itmc Into An Ionic Matrix: the Host-guest Approachmentioning

confidence: 99%

“…Following this result, He et al [81] prepared red LECs using complex 43 emitting at about 650 nm (CIE coordinates x = 0.66; y = 0.33; EQE of 2.6 %); complex 43 has also been used as dopant in the fabrication of white LECs. [159] Modification of the archetype complex 2 by the attachment of electron-withdrawing groups to the 4,4'-positions of the bpy ligand was also made. Complex 44 ( Figure 29) affords LECs with the electroluminescence peaked at 630 nm (CIE: x = 0.710; y = 0.283).…”

Section: Red Lecsmentioning

confidence: 99%

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Luminescent Ionic Transition‐Metal Complexes for Light‐Emitting Electrochemical Cells

Costa¹,

Ortı́²,

Bolink³

et al. 2012

Angew Chem Int Ed

890

1,107

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Higher efficiency in the end-use of energy requires substantial progress in lighting concepts. All the technologies under development are based on solid-state electroluminescent materials and belong to the general area of solid-state lighting (SSL). The two main technologies being developed in SSL are light-emitting diodes (LEDs) and organic light-emitting diodes (OLEDs), but in recent years, light-emitting electrochemical cells (LECs) have emerged as an alternative option. The luminescent materials in LECs are either luminescent polymers together with ionic salts or ionic species, such as ionic transition-metal complexes (iTMCs). Cyclometalated complexes of Ir(III) are by far the most utilized class of iTMCs in LECs. Herein, we show how these complexes can be prepared and discuss their unique electronic, photophysical, and photochemical properties. Finally, the progress in the performance of iTMCs based LECs, in terms of turn-on time, stability, efficiency, and color is presented.

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Section: Diluting An Itmc Into An Ionic Matrix: the Host-guest Approachmentioning

confidence: 99%

Section: Red Lecsmentioning

confidence: 99%

Luminescent Ionic Transition‐Metal Complexes for Light‐Emitting Electrochemical Cells

Costa¹,

Ortı́²,

Bolink³

et al. 2012

Angew Chem Int Ed

890

1,107

View full text Add to dashboard Cite

show abstract

“…The typical host-guest device is that based on 43, a blue-green emitter (k PL = 491 nm in the neat film), and 44, which is a deep-red emitter (k PL = 672 nm in the neat film) [78]. A small amount of 44 (0.4 wt %) doped into 43 ensures a partial energy transfer (although not stated in this case, other references on white emitting LEECs describe this kind of energy transfer as Förster in nature) [55] from the excited blue host to the red emitting guest, resulting in emission from both chromophores, and giving white light as a result.…”

Section: Host-guest Leecsmentioning

confidence: 99%

Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Henwood

Zysman‐Colman

2016

Topics in Current Chemistry Collections

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“…The dye-sensitized solar cell having a photo-electricity conversional efficiency of 11% had been reported. ( Nazeeruddin M. K., 2005;Grätzel M., 2008;Su H. C., 2008) But the synthetic route of traditional organic ruthenium dye ligand is time-consuming and it is difficult to purify. (Wang P., 2003)In addition, the photo-electricity conversion efficiency of organic ruthenium dye is insufficient.…”

Section: Introductionmentioning

confidence: 99%

“…After finishing the reaction, the mixture was extracted with CH 2 Cl 2 and dry over anhydrous MgSO 4 . After rotary evaporation solvent under a reduced pressure, the crude was purified by column chromatography with ethyl acetate as eluent to afford the white powder product(1.6g, 43.3 % yield) Elemental analysis [%, C 11 ( Su H. C., 2008) 9H-4,5-diazafluoren (2.0 g) was dissolved in 10 mL THF, (CH 3 ) 3 COK (0.53 g) and 1-Bromo-2-ethylhexane (0.71 g) was added into the above THF solution. The mixture was stirred for 4 hours under room temperature.…”

mentioning

confidence: 99%

Synthesis and Application of New Ruthenium Dye Containing 9,9-[di-(2-ethylhexane]-4,5-diazafluorene Ligand

Ma¹,

Gao²,

Wang³

et al. 2011

MAS

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The traditional organic ruthenium dyes have some disadvantages, such as the routes of the synthesis of ligands being too time-consuming, the separation and purification of the ligands being difficult, the lower photo-electric conversion efficiency and so on. In view of these disadvantages, we designed and synthesized a new 9,9-[di-(2-ethylhexane]-4,5-diazafluorene ligand. Then we got the dye-sensitized solar cell using this ligand. Such ruthenium dye contains a kind of derivative of 4,5-diazafluorene ligand, and comparing with the traditional bipyridine ligands, the synthetic route is more simple and it's suitable for large-scale practical application. The short-circuit current (Jsc), open-circuit voltage(Voc), fill factor (ff) and photoelectric conversion efficiency(η) of the prepared dye-sensitized solar cell is 14.75-15.02 mA/cm 2 , 681-696 mV, 0.66-0.70, 6.8-7.0 % respectively, when measured in the standard AM 1.5 simulated sunlight. Keywords: 4,5-diazafluorene ligand, Dye-sensitized solar cell, Ruthenium dye The solar energy is the most ideal clean energy in multitudinous renewable energy undoubtly, and it may meet the needs of production and life of people. At present, among numerous kinds of solar cells, the silicon solar cell has occupied the main share of solar cell market depending on its high conversion rate and mature technology. However, the silicon solar cell's operating cost is high and it is difficult to further enhance the efficiency of it. Besides, its raw materials is expensive. So the silicon solar cell's popularization is hard. In 1991, professor Grätzel coming from Swiss Federation Senior Engineer had reported highly effective dye-sensitized solar cell . (Brian O'regan, 1991) Dye-sensitized solar cell's photo-electricity conversional efficiency has been closed to that of the silicon solar cell after more than ten years's unceasing research. More importantly, the production cost of dye-sensitized solar cell is only 1/10 to the cost of the silicon solar cell. So the dye-sensitized solar cell has a good application prospect and it will substitute for the silicon cell to occupy the solar cell market in the future. The dye-sensitized solar cell having a photo-electricity conversional efficiency of 11% had been reported. ( Nazeeruddin M. K., 2005;Grätzel M., 2008;Su H. C., 2008) But the synthetic route of traditional organic ruthenium dye ligand is time-consuming and it is difficult to purify. (Wang P., 2003)In addition, the photo-electricity conversion efficiency of organic ruthenium dye is insufficient. (Gao F. F., 2008) In order to solve the above problems, in this article, we have designed and synthesized a new kind of ligand which includes the 4,5-diazafluorene and furtherly, we have done the application of it in the dye-sensitized solar cell. The synthetic routes of the ligand and the ruthenium dye are shown in Scheme 1 and Scheme 2.

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Solid-State White Light-Emitting Electrochemical Cells Using Iridium-Based Cationic Transition Metal Complexes

Cited by 262 publications

References 35 publications

Luminescent Ionic Transition‐Metal Complexes for Light‐Emitting Electrochemical Cells

Luminescent Ionic Transition‐Metal Complexes for Light‐Emitting Electrochemical Cells

Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Synthesis and Application of New Ruthenium Dye Containing 9,9-[di-(2-ethylhexane]-4,5-diazafluorene Ligand

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