A Luminescent Guest@MOF Nanoconfined Composite System for Solid-State Lighting

Abstract

A series of rhodamine B (RhB) encapsulated zeolitic imidazolate framework-8 (RhB@ZIF-8) composite nanomaterials with different concentrations of guest loadings have been synthesized and characterized in order to investigate their applicability to solid-state white-light-emitting diodes (WLEDs). The nanoconfinement of the rhodamine B dye (guest) in the sodalite cages of ZIF-8 (host) is supported by fluorescence spectroscopic and photodynamic lifetime data. The quantum yield (QY) of the luminescent RhB@ZIF-8 material approaches unity when the guest loading is controlled at a low level: 1 RhB guest per ~7250 cages. We show that the hybrid (luminescent guest) LG@MOF material, obtained by mechanically mixing a suitably high-QY RhB@ZIF-8 red emitter with a green-emitting fluorescein@ZIF-8 “phosphor” with a comparably high QY, could yield a stable, intensity tunable, near-white light emission under specific test conditions described. Our results demonstrate a novel LG@MOF composite system exhibiting a good combination of photophysical properties and photostability, for potential applications in WLEDs, photoswitches, bioimaging and fluorescent sensors.

Robust and Reliable Organic Dye-Embedded Zinc Oxide Nanocomposite Phosphor with a Broad Spectrum and High Efficiency Enables an Eco-Friendly White Laser Light Diode

“…The PLQY of RhB dispersed in a methanol solution was tested to be 49.37%, which was in agreement with the literature report. 44 The PLQY of ZnO NP solution was only 7.12%, whereas the introduction of RhB significantly enhanced the PLQY of R-ZnO NPs. Specifically, R-ZnO-30% dispersed in a methanol solution showed the highest PLQY of 85.21% (Figure S8), which was one of the highest PLQYs in the ZnO-based domain (Figure 4a).…”

Highlighting Recent Crystalline Engineering Aspects of Luminescent Coordination Polymers Based on F-Elements and Ditopic Aliphatic Ligands

“…The contributions of non-radiative pathways mainly include electron transfer quenching, back-energy transfer to the sensitizer as well as quenching by organic vibrations from the linkers (C-H, O-H, N-H) [79]. Among lanthanide ions, Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ and Dy 3+ are preferred ions for optical device implementation and optoelectronics due to their intense, long-lived and fine emissions into the visible region [12,32,80]. Additionally, Er 3+ , Ho 3+ , Yb 3+ and Tm 3+ ions are suitable ions for up-conversion emissions into visible and near-infrared regions [81,82].…”

Enhanced Luminescence of Dye-Decorated ZIF-8 Composite Films via Controllable D–A Interactions for White Light Emission

“…Among these luminescent materials, MOFs constructing metal ions/clusters with organic ligands have been promising inorganic–organic hybrid porous materials. Compared with other porous materials, MOFs exhibit high specific surface areas, adjustable pore sizes, and high degrees of functionalization. − Additionally, luminescent MOFs have attracted much attention to develop excellent luminescent functional materials in recent years due to their inherent luminescent centers of metal nodes/clusters such as rare-earth cations and chromophoric ligands. − On the other hand, many researchers have tried to encapsulate other luminescent materials like organic fluorescent dyes using MOFs to obtain composite materials, ,,− which can exhibit better fluorescence performance.…”