Controllable three-component luminescence from a 1,8-naphthalimide/Eu(iii) complex: white light emission from a single molecule

Shelton, Alexander H.; Sazanovich, Igor V.; Weinstein, Julia A.; Ward, Michael D.

doi:10.1039/c2cc17182a

Cited by 112 publications

(78 citation statements)

References 19 publications

(8 reference statements)

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“…[103] Additional examples of the molecules 52, 53 and 54 (Scheme 3) demonstrate that the white-light emission is originated from the ET from the blue emissive ligand to the red emissive Eu(III) and Sm(III) center. By coating 52 on the surface of UV light source (395 nm), the white-light emission gives the CIE coordinates of (0.34, 0.33) with the CCT of 5152 K. [104] Except for the ET state, a broad LE excimer emission at around 460 nm, which is based on aggregation or π-stacking of the molecules, is observed in the spectra of complex 53 [105] (Figure 16b). In MeCN, 8 × 10 −6 m of 53 displays a white-light emission with the CIE coordinates of (0.27, 0.25).…”

Section: Intramolecular Energy Transfer (Iet)mentioning

confidence: 99%

“…In addition to the above examples for white-light emission, Nazeeruddin and co-workers reported a mononuclear cyclometalated Ir(III) complex (acetylacetonato)bis(1-methyl-2-phenylimidazole)iridium(III) (99, N996, Scheme 7), which exhibits a broad emission covering from 440 to 800 nm (Figure 35a). [151] Chi and Chou et al demonstrated a series of bis-tridentate Ir(III) complexes (100)(101)(102)(103)(104)(105) in which their emissions display nearly unitary RGB phosphorescence consisting of strong blue emission with two shoulders in the green and red regions. [152] Later, Venkatesan reported a series of gold(III) complexes (106-109, Scheme 7) which exhibit the HE singlet emission and the LE triplet emission.…”

Section: Other Examples For White-light Generationmentioning

confidence: 99%

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Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

et al. 2020

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White organic light‐emitting diodes (WOLEDs) are superior to traditional incandescent light bulbs and compact fluorescent lamps in terms of their merits in ensuring pure white‐light emission, low‐energy consumption, large‐area thin‐film fabrication, etc. Unfortunately, WOLEDs based on multilayered or multicomponent (red, green, and blue (RGB)) emissive layers can suffer from some remarkable disadvantages, such as intricate device fabrication and voltage‐dependent emission color, etc. Single molecules, which can emit white light, can be used to replace multiple emitters, leading to a simplified fabrication process, stable and reproducible WOLEDs. Recently, the performance of WOLEDs by using single molecules is catching up with that of the state‐of‐the‐art devices fabricated by multicomponent emitters. Therefore, an increasing attention has been paid on single white‐light‐emitting materials for efficient WOLEDs. In this review, different mechanisms of white‐light emission from a single molecule and the performance of single‐molecule‐based WOLEDs are collected and expounded, hoping to light up the interesting subject on single‐molecule white‐light‐emitting materials, which have great potential as white‐light emitters for illumination and lighting applications in the world.

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Section: Intramolecular Energy Transfer (Iet)mentioning

confidence: 99%

Section: Other Examples For White-light Generationmentioning

confidence: 99%

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

et al. 2020

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“…The frontier molecular orbitals involved in these processesdisplay variablec ontributions of the constituting transition-metal ions and organic ligands dependingo nt heir electronic properties. [7] More rarely,d ual fluorescence-phosphorescence emission may occur in these kinds of systems, [8] ap henomenon that is highly desirable for whitelight generation, [9] qualitativea nalysis,a nd ratiometric sensing. This unique diversity of excited states provides efficient tools for tuning the physical characteristics of target molecules andt herefore offers attractive and innovative pathways in practically importanta reas, which include electroluminescent devices, [2] sensing, [3] photocatalysis, [4] bioimaging, [5] and memory materials.…”

Section: Introductionmentioning

confidence: 99%

Linking Re^I and Pt^II Chromophores with Aminopyridines: A Simple Route to Achieve a Complicated Photophysical Behavior

Kisel

Melnikov

Grachova

et al. 2017

Chemistry A European J

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The bifunctional aminopyridine ligands H N-(CH ) -4-C H N (n=0, L1; 1, L2; 2, L3) have been utilized for the preparation of the rhenium complexes [Re(phen)(CO) (L1-L3)] (1-3; phen=phenanthroline). Complexes 2 and 3 with NH -coordinated L2 and L3, respectively, were coupled with cycloplatinated motifs {Pt(ppy)Cl} and {Pt(dpyb)} (ppy=2-phenylpyridine, dpyb=dipyridylbenzene) to give the bimetallic species [Re(phen)(CO) (μ-L2/L3)Pt(ppy)Cl] (4, 6) and [Re(phen)(CO) (μ-L2/L3)Pt(dpyb)] (5, 7). In solution, complexes 4 and 6 show MLCT {Re}-based emission at 298 K, which changes to the IL(ppy) state at 77 K. The photophysical properties of compounds 5 and 7 display a pronounced concentration dependence, presumably due to the formation of bimolecular aggregates. Analysis of the spectroscopic data, combined with TD-DFT simulations, suggest that unconventional heteroleptic {Re(phen)}⋅⋅⋅{Pt(dpyb)} π-π stacking operates as the driving force for ground-state association. The latter, together with intra- and intermolecular energy-transfer processes, determines the appearance of multiple emission bands and results in nonlinear relaxation kinetics of the excited states.

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“…[8] From the accumulation of different photoresponsive molecules inside the silica core, complex photophysical events may arise, such as excimer formation, [9,10] photoswitchable fluorescence emission, [11] or resonance energy transfer. [17][18][19][20][21][22] Such displays require a careful control of each color contribution and of the energy transfer between the different dyes to obtain the pure white color according to the CIE standards. In most devices, the white fluorescence arises from the mixing of various dyes having blue, green, and orange fluorescence simultaneously.…”

mentioning

confidence: 99%

“…[17][18][19][20][21][22] Such displays require a careful control of each color contribution and of the energy transfer between the different dyes to obtain the pure white color according to the CIE standards. In most devices, the white fluorescence arises from the mixing of various dyes having blue, green, and orange fluorescence simultaneously.…”

mentioning

confidence: 99%

White Fluorescence from Core–Shell Silica Nanoparticles

et al. 2012

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Silica nanoparticles (NPs) are versatile materials with unique properties. Since the first reports of their colloidal fabrication [1,2] and functionalization [3][4][5] with light-emitting molecules, their photophysical properties have been extensively studied. [6,7] One of the most fascinating advances in this area of research deals with the incorporation of multiple dyes in one nanoparticle, which allows the formation of ultrabright nanoobjects. [8] From the accumulation of different photoresponsive molecules inside the silica core, complex photophysical events may arise, such as excimer formation, [9,10] photoswitchable fluorescence emission, [11] or resonance energy transfer. [12,13] As a result, new luminescent nanoobjects with multiple color emission under a single excitation wavelength are accessible and find applications in sensors, [14,15] biolabeling, [16] and emitting displays.In the meantime, much attention has been directed to the fabrication of white-light-emitting devices. In most devices, the white fluorescence arises from the mixing of various dyes having blue, green, and orange fluorescence simultaneously. [17][18][19][20][21][22] Such displays require a careful control of each color contribution and of the energy transfer between the different dyes to obtain the pure white color according to the CIE standards. This issue has been overcome by Park et al. [23] by blocking any energy transfer between two linked fluorophores with blue and yellow emission. Multiple dye-doped silica NPs may be an interesting alternative to prepare such white displays, as many different light-emitting fluorophores can be hosted in the same unit.s-Tetrazines are aromatic heterocycles that have a structure similar to a benzene ring, where four carbon atoms are replaced by nitrogen. We [24] and others [25] have explored the photophysical and electrochemical properties of these molecules. Indeed, some tetrazines substituted with heteroatoms [26] showed a high fluorescence quantum yield, a good photostability, and a long fluorescence lifetime. Furthermore, stetrazines are extremely electron-deficient and can be reversibly reduced, leading to nonfluorescent species. [27] These photophysical and electrochemical properties make these fluorophores attractive candidate for sensing purposes. [28] In a recent study, we attached tetrazine derivatives onto the surface of silica nanoparticles and evaluated the sensing properties of these nanoobjects. [29] Another recent study from our group [30] showed that a naphthalimide chromophore covalently linked to a tetrazine was able to act as an antenna, increasing the brightness of the tetrazine. Herein we report a new white-light-emitting system based on bichromophoric silica NPs doped by a naphthalimide dye in the inner core and by a tetrazine derivative on the outer shell.Reaction between 1,8-naphthalic anhydride and ethanolamine provided N-(hydroxyethyl)-1,8-naphthalimide 1 rapidly and in good yield. Intermediate 1 was reacted with triethoxy(3-isocyanatopropyl)silane, providing the des...

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Controllable three-component luminescence from a 1,8-naphthalimide/Eu(iii) complex: white light emission from a single molecule

Cited by 112 publications

References 19 publications

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

Linking Re^I and Pt^II Chromophores with Aminopyridines: A Simple Route to Achieve a Complicated Photophysical Behavior

White Fluorescence from Core–Shell Silica Nanoparticles

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Controllable three-component luminescence from a 1,8-naphthalimide/Eu(iii) complex: white light emission from a single molecule

Cited by 112 publications

References 19 publications

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

Linking ReI and PtII Chromophores with Aminopyridines: A Simple Route to Achieve a Complicated Photophysical Behavior

White Fluorescence from Core–Shell Silica Nanoparticles

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Linking Re^I and Pt^II Chromophores with Aminopyridines: A Simple Route to Achieve a Complicated Photophysical Behavior