Polyaromatic Luminescent Nanocrystals for Chemical and Biological Sensors

Abstract

We have designed a new type of fluorescent nanosensors through the preparation of organic luminescent nanocrystals grown in sol−gel films prepared by spin-coating. These nanosensors exhibit low cost preparation and easy nanocrystal functionalizations with the possibility to involve typical molecular probes while the sol−gel matrixes can be used as filters.

Dipolar versus Octupolar Triphenylamine‐Based Fluorescent Organic Nanoparticles as Brilliant One‐ and Two‐Photon Emitters for (Bio)imaging

“…Light‐responsive organic nanoparticles, and especially nanoaggregates and nanocrystals, have gained fundamental and technological importance due to their potential applications in electronic, photonic, and optoelectronic nanolevel devices,1–7 and their scope in future nanoscience and nanotechnology is estimated to be enormous. Very recently, they have also been reported for use as photocatalysts8 and fluorescent sensors for the analysis of biological molecules and pollutants 9–15. In the field of biological and pharmaceutical sciences, they can improve the delivery of dyes for cell labeling,16 as well as the bioavailability of hydrophobic photosensitizers for anticancer phototherapy 17.…”

Molecular motion and mobility in an organic single crystal: Raman study and model

“…5,6,11,12-tetraphenyltetracene, also known as rubrene, is an oligoacene derivative. Rubrene has an almost 100% photoluminescent yield 8 and has been used in devices such as chemical sensors 9 and actinometers 10 as well as OLEDs ͑Refs. 11 and 12͒ and OFETs.…”

Direct Condensation Method for the Preparation of Organic‐Nanoparticle Dispersions

“…The investigation of nanoparticles and microcrystals of such organic molecular materials is currently a rapidly growing field. Research on these particles is inspired by their high potential for applications in fields such as optoelectronic devices, [1][2][3] optical data storage, [4] chemo-and biosensors, [5,6] and photocatalysis. [7] Such nanoparticles and microcrystals of organic molecular materials very often represent an intermediate state, lying in between that of molecular solutions and bulk solid phases of the respective material.…”

“…Similar photoluminescence spectra were found for tetracene and rubrene particles prepared by reprecipitation. [5] In order to asses their potential for practical applications, the dispersions prepared were evaluated for several further processing steps, such as centrifugation, dialysis, spin-coating, spray-coating, or inkjet printing. Following centrifugation, all organic-nanoparticle dispersions were easily redispersed.…”