On the assignment of the absorption bands in the optical spectrum of Alq3

Kishore, V.; Aziz, Azlina Abdul; Narasimhan, K. L.; Periasamy, N.; Meenakshi, P. S.; Wategaonkar, Sanjay

doi:10.1016/s0379-6779(01)00553-7

Cited by 59 publications

(46 citation statements)

References 24 publications

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“…These two main absorption bands have been assigned to the 1 B b (260 nm), and the 1La (383 nm) excited states, [13] while the smaller absorption peaks around 320 nm have been attributed to a vibronic progression by analogy with the spectrum of the protonated form of the ligand. [14] Given the similarity with the AlQ 3 spectrum, it seems reasonable to assume that this assignment also applies to the REQ 3 s.…”

Section: Uv-visible Absorption Spectroscopymentioning

confidence: 98%

“…The AlQ 3 spectrum is in excellent agreement with those in the literature. [13,14] The REQ 3 spectra are dominated by the absorption from the organic ligands, due to the fact that the absorption coefficients of typical organic molecules are orders of magnitude higher than those of the rare earth ions. [3] As with the FTIR spectra, the UV-vis spectra of the REQ 3 s are very similar to each other, with the largest absorption peak occurring at 263 nm, and the second largest at 380 nm.…”

Section: Uv-visible Absorption Spectroscopymentioning

confidence: 99%

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Obtaining Characteristic 4f–4f Luminescence from Rare Earth Organic Chelates

Thompson¹,

Blyth

Gigli

et al. 2004

Adv Funct Materials

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We report a study of a series of heavy rare earth tris‐8‐hydroxyquinolines (REQ3s), using UV‐visible absorption spectroscopy, infrared absorption spectroscopy, and photoluminescence (PL) measurements. We show that the heavy REQ3s are all chemically similar to each other and to aluminium tris‐8‐hydroxyquinoline, at least in terms of the ligand behavior. Characteristic rare earth 4f–4f luminescence is only observed for ErQ3 and YbQ3 due to the relatively low energy of the ligand triplet state. We show that a triplet transfer mechanism cannot be responsible for the observed Yb 4f–4f luminescence observed in YbQ3. Instead, an internal chemiluminescent process is shown to be energetically favorable. The thin film PL spectra of all the heavy REQ3s are dominated by triplet emission, except for that of ErQ3, for which transfer to the Er3+ ion represents an efficient alternative. The PL spectra of powder samples, which would be expected to consist of approximately equal amounts of both isomers, are dominated by singlet emission. This is in contrast to the results from the thin films, and suggests that the isomer which predominates in the thin films has a much higher intersystem crossing rate than the other isomer.

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Section: Uv-visible Absorption Spectroscopymentioning

confidence: 98%

Section: Uv-visible Absorption Spectroscopymentioning

confidence: 99%

Obtaining Characteristic 4f–4f Luminescence from Rare Earth Organic Chelates

Thompson¹,

Blyth

Gigli

et al. 2004

Adv Funct Materials

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“…8-hydroxyquinoline (8-HQ), which is known to complex with aluminum ions (Al cations) and then fluoresce strongly with UV excitation [22], was dissolved in DCM and added to the dissolved PMMA solution making a concentration of 30 : 100 (PMMA) by weight. The detection of Al cations is of particular interest as it provides a marker of aluminum corrosion [23] and is also an environmental hazard [24].…”

Section: One Step Functionalization Processmentioning

confidence: 99%

“…The measured result before immersion subtracted from the after immersion results is presented in Fig. 2(b), which shows the fluorescence peak of 8-HQ complexed with Al cations [22] increasing over time. This result demonstrates the ability of a thin polymer film functionalized fiber to detect Al cations, with the potential for corrosion detection, and confirms sufficient mobility of the 8-HQ within the polymer matrix to allow complexation with the Al cations.…”

Section: Sensing Measurementsmentioning

confidence: 99%

Novel polymer functionalization method for exposed-core optical fiber

Kostecki

Ebendorff-Heidepriem

Afshar

et al. 2014

Opt. Mater. Express

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“…2. The rigid octahedral complex that forms between three 8-HQ molecules and Al 3+ fluoresces strongly at 516 nm (max) when excited by ultraviolet (UV) light in the range 360 to 390 nm, 10 although it has also been shown to work effectively when using a 405 nm excitation light source.…”

Section: Principles and Backgroundmentioning

confidence: 99%

Fiber optic approach for detecting corrosion

et al. 2016

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Corrosion is a multi-billion dollar problem faced by industry. The ability to monitor the hidden metallic structure of an aircraft for corrosion could result in greater availability of existing aircraft fleets. Silica exposedcore microstructured optical fiber sensors are inherently suited towards this application, as they are extremely lightweight, robust, and suitable both for distributed measurements and for embedding in otherwise inaccessible corrosion-prone areas. By functionalizing the fiber with chemosensors sensitive to corrosion by-products, we demonstrate in-situ kinetic measurements of accelerated corrosion in simulated aluminum aircraft joints.

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On the assignment of the absorption bands in the optical spectrum of Alq3

Cited by 59 publications

References 24 publications

Obtaining Characteristic 4f–4f Luminescence from Rare Earth Organic Chelates

Obtaining Characteristic 4f–4f Luminescence from Rare Earth Organic Chelates

Novel polymer functionalization method for exposed-core optical fiber

Fiber optic approach for detecting corrosion

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