Luminescent ion pairs with tunable emission colors for light-emitting devices and electrochromic switches

Guo, Song; Huang, Tianci; Liu, Shujuan; Zhang, Kenneth Yin; Yang, Huiran; Han, Jisheng; Zhao, Qiang; Huang, Wei

doi:10.1039/c6sc02837c

Cited by 54 publications

(33 citation statements)

References 60 publications

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“…Ir(III) complexes, as the most excellent phosphorescent materials, have developed rapidly in recent years, because of their advantageous photophysical properties, such as high phosphorescent luminescence efficiency, long emission lifetimes, large Stokes shifts, excellent photo‐ and thermostability, and tunable emission wavelengths . Most of the d 6 Ir(III) complexes exhibit an octahedral configuration with six coordinating positions, and they can be classified into neutral and ionic iridium(III) complexes according to the difference of the carried charge .…”

Section: Phosphorescent Transition‐metal Complexesmentioning

confidence: 99%

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Han

Guo

et al. 2018

Advanced Optical Materials

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548

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Due to the characteristics of optical rotation, selective emission of polarized light, and circular dichroism, circularly polarized luminescent materials have aroused extensive attentions, and they have exhibited wide optoelectronic applications, such as optical data storage, liquid crystal display, and backlights in 3D displays. Here, the research progress of circularly polarized luminescent materials for organic optoelectronic devices is summarized. First, the definition and measurement of the circularly polarized light, such as optical rotatory dispersion, circular dichroism, and circularly polarized luminescence, are systematically introduced. Subsequently, the design strategies for various kinds of circularly polarized luminescent materials, including luminescent lanthanide and transition‐metal complexes, small organic luminophores, conjugated polymers, supramolecules, and liquid crystals are summarized. These materials exhibit circularly polarized luminescence with different magnitudes of luminescence dissymmetry values (glum). They are further applied in optoelectronic devices with excellent performance, and the influence factors on the glum values of these materials are presented in detail. Finally, the current opportunities and challenges in this rapidly growing research field are discussed systematically. The circularly polarized luminescent materials with large glum and high luminescence efficiency are very promising for applications in organic optoelectronic fields.

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Section: Phosphorescent Transition‐metal Complexesmentioning

confidence: 99%

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Han

Guo

et al. 2018

Advanced Optical Materials

Self Cite

548

346

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“…In the development of functional materials, optical materials, especially luminescent materials with colour tunable emission, play an important part (Shu et al, 2008;He et al, 2009). The luminescent materials can be used in the field of organic lightemitting diodes (Tsuzuki et al, 2003;Hu et al, 2012;Joo et al, 2014;Yan et al, 2018;Tan et al, 2016), drug delivery (Ramachandran et al, 2013;Lu et al, 2012), cell labelling (Tang et al, 2010;Hiblot et al, 2017;Dou et al, 2013), and emitting devices (Noda et al, 1997;Zhu et al, 2018;Guo et al, 2017). There are many kinds of pathways to tune luminescence colour, such as aggregation (Hong et al, 2011;Ma et al, 2018), host-guest interaction based on metal-organic frameworks (Lustig et al, 2017;Cui et al, 2012;Yang & Yan, 2016b), control of anti-Stokes shift of luminescent materials (Zhu et al, 2017;Mase et al, 2018), adjustment of quantum dot size (Hildebrandt et al, 2017;Wang et al, 2018), and change of triplet state level of the phosphorescence material (Xia & Liu, 2016;Cheng et al, 2018;Mao et al, 2015;d'Agostino et al, 2015;Ventura et al, 2014;He et al, 2017;An et al, 2015;Yang & Yan, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Cocrystals with tunable luminescence colour self-assembled by a predictable method

Liu

Wen

et al. 2018

Acta Crystallogr Sect B

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Organic light-emitting materials play an essential role in the field of luminescent materials because they are easily prepared and they have controllable luminescent properties. Here it is shown that intermolecular interactions and luminescent properties of cocrystals can be predicted using the molecular surface electrostatic potential of selected -hole/-holeÁ Á Á bonding donor haloperfluorobenzenes and acceptor acenaphthene (AC). Single-crystal X-ray diffraction data reveal that actual bonding patterns in five cocrystals assembled from haloperfluorobenzenes and AC are in accordance with predictable patterns of intermolecular interactions; that is -holeÁ Á Á bond is the major interaction in AC-octafluoronaphthalene, AC-1,4-dibromotetrafluorobenzene and AC-1,3,5-tribromo-2,4,6-trifluorobenzene cocrystals, whereas -holeÁ Á Á bond is the major interaction in AC-1,4-diiodotetrafluorobenzene and AC-1,3,5-trifluoro-2,4,6-triiodobenzene cocrystals. The luminescent properties of the cocrystals are affected by the bonding patterns between AC and haloperfluorobenzenes; the -holeÁ Á Á bond leads to weak phosphorescence, whereas the -holeÁ Á Á bond results in weak delayed fluorescence and relatively strong phosphorescence. research papers Acta Cryst. (2018). B74, 610-617 Lili Li et al. Cocrystals with tunable luminescence colour 611 research papers Acta Cryst. (2018). B74, 610-617 Lili Li et al. Cocrystals with tunable luminescence colour 617

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“…Synthesis of Intermediate 10 : To a stirred solution of 2‐phenylquinoline (1.00 g, 4.74 mmol) in ethylene glycol/water (12.0 mL, 3:1 v/v) at room temperature was added IrCl 3 .3H 2 O (0.77 g, 2.20 mmol) . Then the reaction system was heated to reflux under nitrogen atmosphere for 24 h. Next, a large amount of water was added to the mixture when cooling down to room temperature and filtered.…”

Section: Methodsmentioning

confidence: 99%

“…However, it is difficult to tune the emission color of these Pt(II) complexes to the shorter wavelength. Owing to the advantageous photophysical properties of phosphorescent Ir(III) complexes, such as high luminescence quantum yields and tunable emission colors, they are the most excellent candidate for CP‐PhOLEDs . However, there are very few reports about the use of phosphorescent Ir(III) complexes as chiral emissive dopants in CP‐PhOLEDs.…”

Section: Introductionmentioning

confidence: 99%

Circularly Polarized Phosphorescent Electroluminescence from Chiral Cationic Iridium(III) Isocyanide Complexes

Han

Guo

Wang

et al. 2017

Advanced Optical Materials

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119

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applications in optical data storage, backlights in 3D displays and liquidcrystal display, spin sources in optical spintronics, and information carriers in quantum computation. [1][2][3][4][5][6][7][8][9][10] For CPL, the luminescence dissymmetry factor (g factor) is an important parameter to evaluate the degree of polarization, which is defined as g = ΔI/I = 2(I L − I R )/(I L + I R ), where I L and I R represent the left and right-handed luminescence polarized intensity values, respectively. [11,12] Currently, CP light is often obtained from nonpolarized light through the filters, which however results in low efficiency and high cost. So it is necessary to develop a new generation of device that can directly emit CP light. [13] Circularly polarized phosphorescent organic light-emitting diodes (CP-PhOLEDs) based on transition metal complexes, such as those of Ir(III) and Pt(II), are able to achieve theoretically 100% internal quantum efficiency through harvesting triplet excitons because singlet and triplet excitons can be synchronously utilized by spin-orbit coupling interactions induced by heavy metal atoms. [14][15][16][17][18] To the best of our knowledge, there are few reports about the utilization of chiral phosphorescent Pt(II) or Ir(III) complexes in CP-PhOLEDs. For example, Shen et al. designed a series of Pt(II) complexes (see A1 in Figure 1 and Table S1, Supporting Information) bonding a chiral sulfoxide ligand, which showed red emission and possessed a relatively high g value of the order of 10 −3 but without further capitalizing on the devices. [19] More recently, Brandt et al. synthesized a phosphorescent Pt(II) complex (see A2 in Figure 1 and Table S1, Supporting Information) with helical chirality achieving efficient red phosphorescence emission of devices but with inferior device performance, and its highest |g EL | value was up to 0.38. [20] However, it is difficult to tune the emission color of these Pt(II) complexes to the shorter wavelength. Owing to the advantageous photophysical properties of phosphorescent Ir(III) complexes, such as high luminescence quantum yields and tunable emission colors, they are the most excellent candidate for CP-PhOLEDs. [21][22][23][24] However, there are very few reports about the use of phosphorescent Ir(III) complexes as chiral emissive dopants in CP-PhOLEDs. For example, Li et al. reported a series of iridium phosphor isomers by introducing a chiral carbon center (R/S-edp, (R)/(S)-2-(4-ethyl-4,5-dihydrooxazol-2-yl) phenol) as ancillary ligands to obtain enantiomeric Ir(III) complexes (see B1 and B2 in Figure 1 and Table S1, Circularly polarized organic light-emitting diodes (CP-OLEDs), which directly emit CP light from organic light-emitting diodes, have attracted considerable attention because of their wide applications in various photonic devices. In this work, a pair of chiral bis-cyclometalated phosphorescent iridium(III) isocyanide complexes is designed and synthesized, which exhibits almost the same photophysical properties and obvious mirror image in ...

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Luminescent ion pairs with tunable emission colors for light-emitting devices and electrochromic switches

Abstract: A class of luminescent ion pairs with tunable emission colors was designed and synthesized for light-emitting devices and electrochromic switches.

Cited by 54 publications

References 60 publications

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Recent Progress on Circularly Polarized Luminescent Materials for Organic Optoelectronic Devices

Cocrystals with tunable luminescence colour self-assembled by a predictable method

Circularly Polarized Phosphorescent Electroluminescence from Chiral Cationic Iridium(III) Isocyanide Complexes

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