Reliability study under thermal and photonic stresses of sulforhodamine B (SRB) confined in layered double hydroxide (LDH)

Abstract

When sulforhodamine B (SRB) is entrapped in a tightly packed hybrid material composed of dodecylsulfate anions interleaved in layered double hydroxide, the organic dye is considered as a possible red-emitting phosphor for white light-emitting diodes (WLEDs). To confirm such promising potential, a reliability study is here undertaken and the materials and their associated silicone films are subjected to different thermal and photonic stresses. Optical properties, photoluminescence quantum yields and emission spectra are recorded after photo-aging studies. Interestingly, the composite silicone film is found to be completely stable under blue LED excitation, while in the absence of the hybrid LDH the emission of SRB decays rapidly, thus underlining the protective role of the LDH hybrid cargo. At this stage, these results confirm the potential offered by a system consisting of such an emitter film and a blue LED. This system also opens up new possibilities for interesting organic dyes that are sensitive to photonic and/or thermal stresses.

Perylene diimide derivative dispersed in LDH as a new efficient red-emitting phosphor for LED applications

“…The strong dehydration of the former causes the loss of stacking and therefore indirectly the aggregation of the phosphors once they are no longer confined. 55 More investigation is required to improve phosphor hybrid assembly stabilization in this higher temperature domain above 100 1C. The emission spectra recorded after 3000 min (80 1C) and 7000 min (120 1C) of illumination by the blue LED illustrate this rapid drop in emission intensity for higher temperatures (Fig.…”

“…The strong dehydration of the former causes the loss of stacking and therefore indirectly the aggregation of the phosphors once they are no longer confined. 55…”

Efficient dispersion of organic fluorophores by size matching with a new di-functionalized spacer interleaved into layered double hydoxide

“…16 Absolute PLQY of the Si-LDH40 film before and after the heat treatments Depending on the excitation wavelength, a greater or lesser loss of yield is observed after heat treatment. Legentil et al demonstrated that the pristine silicone film does not degrade at these temperatures [59], thus any loss in PLQY should be attributed to the LDH powder. Under 360 nm, a relative loss of approximately 3% and 5% only is observed after treatment at 85°C and 120°C respectively.…”

“…This phenomenon, called the pillaring effect, has been extensively studied using terephthalate (TA) as an interleaved anion for various applications [39,[54][55][56][57][58]. Legentil et al were the only ones to try to use this anion as a spacer to host SRB molecules between LDH layers, but it led to unsatisfactory results in terms of the resulting optical properties [59].…”

Co-Ni LDHs/PES Hybrid Membrane Synergizes With PMS to Effectively Degrade Orange Ⅱ

“…At 30min, the TOC of the membrane dropped from 10.48mg•L -1 to 4.74 mg•L -1 , the mineralization rate reached 54.76%. Combined with spectrum scanning, it was speculated that the azo bond and naphthalene ring of AO7 were oxidized to form aromatic compounds with benzene ring as the main body, some intermediate products can be further degraded into small molecule organics, finally mineralized into CO2 and H2O (Legentil et al 2021). According to previous research, tertiary butanol (TBA), methanol (MeOH), phenol, furfuryl alcohol (FFA), p-benzoquinone (p-BQ) and other substances are usually used to quench the freedom that may be generated in the catalytic degradation process.…”