Photoswitchable semiconductor nanocrystals with self-regulating photochromic Förster resonance energy transfer acceptors

Dı́az, Sebastián A.; Gillanders, Florencia; Jares‐Erijman, Elizabeth A.; Jovin, Thomas M.

doi:10.1038/ncomms7036

Cited by 82 publications

(63 citation statements)

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“…These complexes exhibited tunable ECL performance, and the effect of C ^ N ligands on the ECL performance was investigated in detail. Their photophysical properties have been summarized in Table S1 Stimuli-responsive materials have been considered as "intelligent" materials because of their sensitivity to external stimuli, [ 1,2 ] such as temperature, [ 3,4 ] solvent or vapor, [ 5,6 ] mechanical force, [7][8][9][10] light, [11][12][13][14] and electric or magnetic fi elds. The obtained complexes were characterized by nuclear magnetic resonance (NMR) and matrix-assisted laser desorption ionization time-of-fl ight mass spectrometry, cyclic voltammetry, UV/Vis absorption spectrometry, and steady-state and transientstate photoluminescence spectrometry Complexes Ir1 − Ir4 exhibit tunable emission colors from green to red in CH 3 CN solution (Figure 1 , middle), which are dependent on the C^N ligands.…”

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confidence: 99%

Tunable Electrochromic Luminescence of Iridium(III) Complexes for Information Self‐Encryption and Anti‐Counterfeiting

Zhao

Sun

et al. 2016

Advanced Optical Materials

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COMMUNICATIONand easy detection of luminescence signals, rational designs of luminescent materials that are sensitive to electrical stimuli are very important because of their promising applications for fabricating new-generation smart optoelectronic devices.Phosphorescent transition-metal complexes are an attractive candidate for stimuli-responsive luminescent materials due to their various charge-transfer excited states, including triplet metal-to-ligand charge transfer ( 3 MLCT), ligand-toligand charge transfer ( 3 LLCT), and intraligand charge transfer states. [ 33 ] These charge-transfer excited states are sensitive to external stimuli. Recently, we have reported an ionic phosphorescent Ir(III) complex [ppy 2 IrN ^ N] + PF 6 − (ppy, 2-phenylpyridine; N ^ N, 2-(2-pyridyl)benzimidazole) containing a polarizable N-H group in N ^ N ligand that displays interesting electrochromic luminescence from yellow to green near anode after applying a voltage. [ 34 ] This electrochromic luminescence is attributed to the generation of an internal electric fi eld caused by migration of anionic counterions under an applied electric fi eld, which leads to a change in excited-state properties of complex. Considering the ligand-dependent excited-state properties of Ir(III) complexes, it is very important to demonstrate whether the ECL performance can be tuned by changing the ligands of complexes and different luminescence-responsive modes to the electric fi eld can be realized, which are necessary for practical applications of the ECL materials.In this work, we designed and synthesized a series of ionic phosphorescent Ir(III) complexes [(C ^ N) 2 IrN ^ N] + PF 6 − ( Figure 1 , left) containing the same N ^ N ligand (2-(2-pyridyl)benzimidazole) and different C^N ligands, 2-(2,4-difl uorophenyl)pyridine (dfppy) for Ir1 , 2-( p -tolyl)pyridine (tpy) for Ir2 , 2-phenylquinoline (pq) for Ir3 , and 2-(thiophen-2-yl)quinoline) (tpq) for Ir4 . These complexes exhibited tunable ECL performance, and the effect of C ^ N ligands on the ECL performance was investigated in detail. The detailed synthetic routes of the complexes are given in Scheme S1 in the Supporting Information. The obtained complexes were characterized by nuclear magnetic resonance (NMR) and matrix-assisted laser desorption ionization time-of-fl ight mass spectrometry, cyclic voltammetry, UV/Vis absorption spectrometry, and steady-state and transientstate photoluminescence spectrometry Complexes Ir1 − Ir4 exhibit tunable emission colors from green to red in CH 3 CN solution (Figure 1 , middle), which are dependent on the C^N ligands. Their photophysical properties have been summarized in Table S1 in the Supporting Information. Next, we investigated their luminescence

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confidence: 99%

Tunable Electrochromic Luminescence of Iridium(III) Complexes for Information Self‐Encryption and Anti‐Counterfeiting

Zhao

Sun

et al. 2016

Advanced Optical Materials

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“…FLIM) and various modes for achieving spatial super-resolution. The latter effort has also involved the generation of suitable organic and nanoparticular probes [19,20].…”

Section: Discussionmentioning

confidence: 99%

Generation 3 programmable array microscope (PAM) for high speed large format optical sectioning in fluorescence

et al. 2015

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We report on the current version of the optical sectioning programmable array microscope (PAM) implemented with a single digital micro-mirror device (DMD) spatial light modulator utilized as a mask in both the fluorescence excitation and emission paths. The PAM incorporates structured illumination and structured detection operating in synchrony. A sequence of binary patterns of excitation light in high definition format (19201080 elements) is projected into the focal plane of the microscope at the 18 kHz binary frame rate of the Texas Instruments 1080p DMD. The resulting fluorescent emission is captured as two distinct signals: conjugate (c, ca. "on-focus") consisting of light impinging on and deviated from the "on" elements of the DMD, and the non-conjugate (nc, ca. "out-of-focus") light falling on and deviated from the "off" elements. The two distinct, deflected beams are optically filtered and detected either by two individual cameras or captured as adjacent images on a single camera after traversing an image combiner. The sectioned image is gained from a subtraction of the nc image from the c image, weighted in accordance with the pattern(s) used for illumination and detection and the relative exposure times of the cameras. The widefield image is given by the sum of the c and nc images. This procedure allows a high duty cycle (typically 25-50%) of on-elements in the excitation patterns and thus functions with low light intensities, preventing saturation and minimizing photobleaching of sensitive fluorophores. The corresponding acquisition speed is also very high, limited only by the bandwidth of the camera(s) (100 fps full frame with the sCMOS camera in current use) and the optical power of the light source (lasers, large area LEDs). In contrast to the static patterns typical of SIM systems, the programmable array allows optimization of the patterns (duty cycle, feature size and distribution), thus enabling a wide range of applications, ranging from patterned photobleaching, (e.g., FRAP, FLIP) and photoactivation, spatial superresolution, automated adaptive tracking and minimization of light exposure (MLE), and photolithography.

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“…The advantage here is their large ultraviolet-visible absorption cross-section and broad range of wavelengths that can be used for excitation (Díaz et al 2015 ).…”

Section: Modulation By Lightmentioning

confidence: 99%

Fluorescent Nanocomposites

Demchenko¹

2015

Introduction to Fluorescence Sensing

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In previous Chapters we discussed different properties of fl uorescence emitters in order to understand them and optimize them adapting for different sensing and imaging technologies. New unlimited possibilities are offered by composing the nanocomposites formed of different types of emitters. They display a variety of novel useful features and thus extend dramatically the information content of output data. Researcher can design them from different types of luminophores of molecular and nanoscale origin (Fig. 6.1 ), manipulating with their connection, interaction, formation of new surfaces and interfaces. Their fl uorescence response can be modulated by electronic conjugation or by excited-state resonance energy transfer and coupled with other functionalities on nanoscale level.The luminescent molecules and nanoparticles can serve as building blocks for achieving versatile functions that are not observed in separate emitters alone. These larger nanocomposites demonstrate dramatically increased brightness, the ability to

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Photoswitchable semiconductor nanocrystals with self-regulating photochromic Förster resonance energy transfer acceptors

Cited by 82 publications

References 46 publications

Tunable Electrochromic Luminescence of Iridium(III) Complexes for Information Self‐Encryption and Anti‐Counterfeiting

Tunable Electrochromic Luminescence of Iridium(III) Complexes for Information Self‐Encryption and Anti‐Counterfeiting

Generation 3 programmable array microscope (PAM) for high speed large format optical sectioning in fluorescence

Fluorescent Nanocomposites

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