Lanthanide complexes as OLED emitters

Utochnikova, Valentina V.

doi:10.1016/bs.hpcre.2021.05.001

Cited by 21 publications

(8 citation statements)

References 237 publications

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“…In order to know if the desired o,o′-biphenol is formed during this reaction, dimeric dimethyl-2,2′-(6,6′-dihydroxy-[1,1′-biphenyl]-3,3′- diyl)diacetate (named o,o′-biphenol) was synthesized from MHPA according to a described procedure via a biomimetic iron(III)-catalyzed solid-phase coupling reaction. 27 The resulting product has been characterized by 1 H NMR (see the SI for the assignment of NMR signals) and analyzed by HPLC−UV (Figure 4, red trace). The peak at 5.3 min in the reaction mixture can thus be assigned to o,o′-biphenol as both the retention time and the UV absorbance spectra (Figure 4, inset) are comparable.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Exploitation of Luminescent Lanthanide Nanoparticles for a Sensitivity-Enhanced ELISA Detection Method

Kassir,

Cheignon,

Charbonnière

2024

Anal. Chem.

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A new detection method based on the photoluminescence properties of dye-sensitized lanthanide nanoparticles (Ln NPs) was developed for enzyme-linked immunosorbent assays (ELISAs). In this method, the horseradish peroxidase (HRP) enzyme catalyzes the oxidation of phenol derivatives in the presence of hydrogen peroxide, providing dimers that are able to interact with the Ln NP surface and to efficiently photosensitize the Ln ions. Due to the very long emission lifetime of Ln, the timegated detection of Ln NP luminescence allows the elimination of background noise due to the biological environment. After a comparison of the enzyme-catalyzed oxidation of various phenol derivatives, methyl 4-hydroxyphenyl acetate (MHPA) was selected as the most promising substrate, as the highest Ln emission intensity was observed following its HRP-catalyzed oxidation. After a meticulous optimization of the conditions of both the enzymatic reaction and the Ln sensitization (buffer, pH, concentration of the reactants, NP type, etc.), this new detection method was successfully implemented in a commercial insulin ELISA kit as a proof-ofconcept, with an increased sensitivity compared to the commercial detection method.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…Lanthanide compounds display unique highly useful optical properties and are widely used in several applications such as in lighting, light conversion, sensing, biolabeling, and bioimaging . The optical properties of Ln 3+ ions arise from the electronic transitions within the 4f orbitals.…”

Section: Introductionmentioning

confidence: 99%

Exploitation of Luminescent Lanthanide Nanoparticles for a Sensitivity-Enhanced ELISA Detection Method

Kassir,

Cheignon,

Charbonnière

2024

Anal. Chem.

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“…Lanthanide coordination compounds represent one of the most prospective candidates for oximeter materials due to the unique optical properties, which include narrow luminescence bands, providing almost monochromatic emission, and their constant position. − There are some unsurpassed advantages of lanthanide coordination compounds: (1) luminescence of the Yb 3+ ion in the NIR region (λ max = 975 nm) perfectly fits into the transparency window of biological tissues; (2) ideal wavelengths of europium (λ max = 612 nm) and ytterbium luminescence (λ max = 975 nm) for oximetry, at which the ratios of the molar extinction coefficients are the largest; (3) typical narrow emission bands of lanthanide ions, which can be easily detected and do not overlap (in contrast to the broad bands of organic molecules) …”

Section: Introductionmentioning

confidence: 99%

“…(2) ideal wavelengths of europium (λ max = 612 nm) and ytterbium luminescence (λ max = 975 nm) for oximetry, at which the ratios of the molar extinction coefficients are the largest; (3) typical narrow emission bands of lanthanide ions, which can be easily detected and do not overlap (in contrast to the broad bands of organic molecules). 33 Another technological benefit of using lanthanide complexes may be reached through the use of one visible−NIR emissive compound rather than two separate emitters, which will allow creating an oximeter, which utilizes one dual-emissive LED instead of two separate ones. Conventional oximeters consist of one red and one green OLEDs and OPDs (tuned to different wavelengths), while dual-emissive OLED-based oximeter will involve the use of only one OLED and OPD, where OLED and OPD are placed on the same or on separate sides of the finger.…”

Section: ■ Introductionmentioning

confidence: 99%

First Dual Red–Near-Infrared Emissive Solution-Processed Organic Light-Emitting Diode Based on Europium–Ytterbium Mixed-Ligand Complexes for Pulse Oximetry

Kornikov

Kozlov

Vashchenko

et al. 2023

ACS Appl. Opt. Mater.

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For oximetry applications, the first dual red−near-infrared (NIR) emissive organic light-emitting diode (OLED) based on mixed-ligand complexes Eu x Yb 1−x (dbm) 3 BPhen (x = 0; 0.01; 0.02; 0.05; 0.1; 1) is obtained. The photoluminescence quantum yields of the ytterbium and europium in the obtained complexes reach 0.9 and 31%, respectively, which are rather high values for the complexes of these ions. Dual visible−NIR emissive compounds Eu x Yb 1−x (dbm) 3 BPhen are tested in OLEDs, and Eu 0.05 Yb 0.95 (dbm) 3 BPhen demonstrates the most intense electroluminescence both in visible (270 cd/m 2 ) and NIR range (19 μW/cm 2 ). The Eu 0.05 Yb 0.95 (dbm) 3 BPhen-based OLED is successfully used to produce the first lanthanide OLED-based pulsimeter prototype.

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“…Lanthanide ions are famous luminescent centers emitting narrowband light of the UV, visible, and near-infrared (NIR) ranges. , This light finds multiple applications in high technologies including displays, lasers and telecommunication, sensors, luminescence thermometry, and security inks and bioassays. , A remarkable feature of lanthanide f–f luminescence is the possibility of its sensitization by coordinated organic ligands, which effectively absorb the excitation and transfer it to the ions. This behavior, called the antenna effect, makes it possible to significantly increase the luminescence brightness by overcoming the parity forbiddance of electronic transitions inside the 4f subshells of free ions .…”

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Lanthanide Coordination Polymers with Soft-Base Ditopic Bisthiazolate Ligands

Ilichev,

Rogozhin,

Rumyantcev

et al. 2023

Inorg. Chem.

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In order to prepare the first lanthanide coordination polymers (CPs) based on ditopic sulfide ligands, benzo [1,2d:4,5-d′]bisthiazole-2,6(3H,7H)-dithione (H 2 L) was used as a linker. The reactions of lanthanide silylamides Ln[N(SiMe 3 ) 2 ] 3 (Ln = Nd, Gd, Er, and Yb) with H 2 L result in the formation of soluble dimethyl sulfoxide (DMSO) ionic salts [Ln(DMSO) 8 ][L] 1.5 [Ln = Nd (1), Gd (2), Er (3), and Yb ( 4)]. Due to the lack of coordination of anionic ligands, compounds 1, 3, and 4 do not show sensitized metal-centered photoluminescence (PL), while Gd compound 2 shows weak phosphorescence at 77 K. It was found that the heating of 1 in a 1:9 DMSO/1,4-dioxane mixture leads to the formation of large crystals of 2D CP [Nd(DMSO) 3 L 1.5 •0.5diox] n (5), where deprotonated dithione H 2 L plays the role of a ditopic linker. This linker acts as an "antenna" in compound 5, providing an intense near-infrared (NIR) PL of Nd 3+ ion upon near-UV and blue-light excitation. The application of a synthetic protocol similar to that of compounds 2−4 led to the formation of amorphous compounds [Ln(DMSO) 3 L 1.5 •0.5diox] n [Ln = Gd (6), Er (7), and Yb (8)], whose PL properties significantly differ from those of the parental ionic salts. In the case of Yb polymer 8, the PL excitation spectra are shifted to the red region due to a low-energy ligand-to-metal charge-transfer state. The synthesized compounds 5−8 are the first examples of lanthanide CPs using soft-base ditopic linkers in their structures.

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Lanthanide complexes as OLED emitters

Cited by 21 publications

References 237 publications

Exploitation of Luminescent Lanthanide Nanoparticles for a Sensitivity-Enhanced ELISA Detection Method

Exploitation of Luminescent Lanthanide Nanoparticles for a Sensitivity-Enhanced ELISA Detection Method

First Dual Red–Near-Infrared Emissive Solution-Processed Organic Light-Emitting Diode Based on Europium–Ytterbium Mixed-Ligand Complexes for Pulse Oximetry

Lanthanide Coordination Polymers with Soft-Base Ditopic Bisthiazolate Ligands

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