Encapsulation of coumarin dye within lanthanide MOFs as highly efficient white-light-emitting phosphors for white LEDs

Song, Tao; Zhang, Gege; Cui, Yuanjing; Yang, Yu; Qian, Guodong

doi:10.1039/c6ce01870j

Cited by 35 publications

(21 citation statements)

References 36 publications

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“…As a stable, low-cost, high-gain luminescent material, coumarin 460 has applications in many fields. Coumarin 460 can be used as a laser dye [6], a luminescent phosphor in LEDs [7], [8], a luminescent probe and sensor in biological applications [9], and a fluorescer in rewritable optical drives [10]. Many authors have performed experiments using other dyes as the gain media both in solution and in polymer.…”

Section: Introductionmentioning

confidence: 99%

Amplification Characteristics of a Coumarin 460-Based Tunable Amplifier

2020

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We studied the optical signal amplification properties of coumarin 460 (C460) in solution. An optical signal amplification experiment was performed using a side-pumping setup. Amplification of more than 7 dB was achieved over a 13-nm spectral width in the signal wavelength range of 448-461 nm with gains above 10 dB at 448 nm and in the 455-461-nm range. The signal-to-noise ratio (SNR) of the entire band was 5.8-11.1 dB. When the solution concentration and pump energy were 0.001 M (mol/L) and 117 μJ, respectively, the optical gain reached a maximum of 12.25 dB. Thus, the gain and SNR were measured by adjusting the pump energy and solution concentration to determine the optimal concentration of coumarin 460 in methanol solution in the amplifier. Additionally, amplification of the spontaneous emission was found to seriously reduce the SNR, adversely affecting the optical gain.

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Section: Introductionmentioning

confidence: 99%

Amplification Characteristics of a Coumarin 460-Based Tunable Amplifier

2020

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“…They have been found to display various therapeutic activities that include anti‐bacterial , anti‐tumor , anti‐inflammatory , anti‐HIV , anticoagulant , anti‐virus , anti‐tubercular , anti‐diabetic , anti‐thrombotic , antioxidant , activity etc. Apart from these, coumarin and its related compounds have been found to exhibit various applications in materials chemistry, such as light emitting properties , fluorescent sensors , and as dyes .…”

Section: Introductionmentioning

confidence: 99%

An Efficient One‐pot Three‐component Method for the Synthesis of 5‐Amino‐3‐(2‐oxo‐2H‐chromen‐3‐yl)‐7‐aryl‐7H‐thiazolo[3,2‐a]pyridine‐6,8‐dicarbonitriles

Kavitha

Srikrishna

Dubey

et al. 2019

Journal of Heterocyclic Chem

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A facile, convenient, and adequate method has been developed for the synthesis of novel 5‐amino‐3‐(2‐oxo‐2H‐chromen‐3‐yl)‐7‐aryl‐7H‐thiazolo[3,2‐a]pyridine‐6,8‐dicarbonitriles (6) by employing 2‐(4‐(2‐oxo‐2H‐chromen‐3‐yl)thiazol‐2‐yl)acetonitrile (3) as an important precursor. Initially, we have synthesized the target compounds in a stepwise manner and then approached a tandem method to examine the feasibility of one‐pot method. Subsequently, one‐pot three‐component protocol has been established for the synthesis of title compounds by the reaction of 3 with benzaldehyde and malononitrile in refluxing ethanol engender a new six‐membered thiazolo[3,2‐a] pyridine as a hybrid scaffold. Reaction conditions were optimized for this reaction and a broad substrate scope with various aryl and heteroaryl aldehydes make this protocol very practical, attractive, and worthy. Mechanistic aspects for the formation of these compounds were outlined comprehensively. Characterization of these newly synthesized compounds was achieved by means of IR, 1H NMR, 13C NMR, and HRMS.

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“…Fluorescent dyes are a good choice as they show high emission quantum yields. When embedded into hosts, the dyes are isolated from each other preventing aggregation-induced quenching, which restricts internal molecular motions and suppresses nonradiative relaxations [37,38,39]. For example, the 7-diethylamino-4-methylcoumarin (C1) dye with blue emission was incorporated into Eu 3+ /Tb 3+ MOFs and white-light emission with high quantum yield was obtained [37].…”

Section: Introductionmentioning

confidence: 99%

“…When embedded into hosts, the dyes are isolated from each other preventing aggregation-induced quenching, which restricts internal molecular motions and suppresses nonradiative relaxations [37,38,39]. For example, the 7-diethylamino-4-methylcoumarin (C1) dye with blue emission was incorporated into Eu 3+ /Tb 3+ MOFs and white-light emission with high quantum yield was obtained [37]. In other examples, white-light was generated combining the blue emission of an organic ligand and the yellow one of rhodamine B [39] or joining three distinct dyes and playing either with the amount or type of the dyes, or with the excitation wavelength [38].…”

Section: Introductionmentioning

confidence: 99%

White-Light Emitting Di-Ureasil Hybrids

Fang

Ferreira

et al. 2018

Materials

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White-light emitting materials have emerged as important components for solid state lighting devices with high potential for the replacement of conventional light sources. Herein, amine-functionalized organic-inorganic di-ureasil hybrids consisting of a siliceous skeleton and oligopolyether chains codoped with lanthanide-based complexes, with Eu3+ and Tb3+ ions and 4,4′-oxybis(benzoic acid) and 1,10-phenanthroline ligands, and the coumarin 1 dye were synthesized by in situ sol–gel method. The resulting luminescent di-ureasils show red, green, and blue colors originated from the Eu3+, Tb3+, and C1 emissions, respectively. The emission colors can be modulated either by variation of the relative concentration between the emitting centers or by changing the excitation wavelength. White light emission is achieved under UV excitation with absolute quantum yields of 0.148 ± 0.015, 0.167 ± 0.017, and 0.202 ± 0.020 at 350, 332, and 305 nm excitation, respectively. The emission mechanism was investigated by photoluminescence and UV–visible absorption spectroscopy, revealing an efficient energy transfer from the organic ligands to the Ln3+ ions and the organic dye, whereas negligible interaction between the dopants is discerned. The obtained luminescent di-ureasils have potential for optoelectronic applications, such as in white-light emitting diodes.

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Encapsulation of coumarin dye within lanthanide MOFs as highly efficient white-light-emitting phosphors for white LEDs

Cited by 35 publications

References 36 publications

Amplification Characteristics of a Coumarin 460-Based Tunable Amplifier

Amplification Characteristics of a Coumarin 460-Based Tunable Amplifier

An Efficient One‐pot Three‐component Method for the Synthesis of 5‐Amino‐3‐(2‐oxo‐2H‐chromen‐3‐yl)‐7‐aryl‐7H‐thiazolo[3,2‐a]pyridine‐6,8‐dicarbonitriles

White-Light Emitting Di-Ureasil Hybrids

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