A Red‐Emitting Luminescent Material Capable of Detecting Low Water Content in Organic Solvents

Abstract

A new red-emitting luminescent material was prepared from a gel formed by simply mixing EuCl3 ⋅6 H2 O and 4'-para-phenylcarboxyl-2,2':6',2''-terpyridine (Hcptpy) in a molar ratio of 1:2 in anhydrous ethanol at room temperature. It shows bright red luminescence dominated by the (5) D0 →(7) F2 transition of Eu(3+) , a long lifetime (1.16 ms), a high absolute quantum yield (48.2 %), and good thermostability (stable up to 500 °C). In addition, the luminescence of the material can be easily quenched by contact with water, which makes it suitable for detecting low contents of water (0.1-1.5 vol %) in common organic solvents such as diethyl ether and THF.

Photoluminescence properties of a novel red fluoride K2LiGaF6:Mn4+nanophosphor

“…Currently most of the available red phosphors still have certain problems. 10,11 For example, oxide phosphors [12][13][14][15][16] cannot absorb blue light efficiently and sulde phosphors [17][18][19] are unstable because of their high sensitivity to hydrolysis reactions. As for the nitride phosphors, [20][21][22][23] they have overlapping re-absorption with the yellow phosphor and the synthesis conditions are rigid.…”

A simple and green strategy for preparing luminescent Tb 3+ complex-based nanocomposite with stable luminescence in water

“…[1][2][3][4][5][6][7][8][9][10][11][12] Generally, they were prepared in organic solvents and stored under non-aqueous conditions, since the Ln 3+ luminescence can be easily quenched through nonradiative energy transfer from excited states of Ln 3+ to stretching vibrations of coordinated water molecules due to the Franck-Condon overlap between energy levels of Ln 3+ and ligand [13][14][15][16]. This excludes the application of LnNCs in aqueous environment.…”

A Metallogel Based on a Zwitterionic Spirocyclic Meisenheimer Complex: Sensing of Fluoride Ions in Water and Moisture Content in Organic Solvents

“…Fluorescence spectroscopy is especially preferred over other techniques because of the sensitive detection process. In this category, several groups have already reported fluorescence as well as colorimetric sensors for detecting the small quantity of water in the organic medium ,. These sensors are different in the context of the detection limit.…”

“…Some of them can detect moisture above 0.5% ,. There are also some efficient sensors whose moisture detection limit is below 0.5 to 0.1% ,. Sensors able to detect below 0.1% moisture are highly useful as far as extremely low moisture detection is concerned.…”