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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

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Published on: November 10, 2017

Spatially Controlled UV Light Generation at Depth using Upconversion Micelles.

Qi Zhou¹, Brendan M Wirtz², Tracy H Schloemer¹

¹Department of Electrical Engineering, Stanford University, Stanford, 94305, CA, USA.

Advanced Materials (Deerfield Beach, Fla.)

|August 7, 2023

Summary

This summary is machine-generated.

Researchers developed water-compatible upconversion micelles for deep UV light delivery. This breakthrough enables precise photochemical reactions within materials, overcoming previous solubility and penetration limitations.

Keywords:

UV light micelles penetration depth photolysis spatial control upconversion

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Triplet Fusion Upconversion Nanocapsule Synthesis

Triplet Fusion Upconversion Nanocapsule Synthesis

Published on: September 7, 2022

Area of Science:

Photochemistry
Materials Science
Nanotechnology

Background:

UV light is crucial for applications like photocatalysis and drug delivery.
Delivering UV photons deep into materials is challenging due to absorption and scattering.
Triplet-triplet annihilation upconversion (TTA-UC) can generate UV photons from lower-energy ones, but TTA-UC molecules often lack water solubility.

Purpose of the Study:

To develop water-compatible upconversion micelles for efficient UV photon generation deep within materials.
To overcome the poor water solubility limitations of traditional TTA-UC molecules.
To demonstrate precise photochemical control at depth using UV-emitting upconversion micelles.

Main Methods:

Nanoencapsulation of iridium-based complexes to create water-compatible upconversion (UC) micelles.
Fabrication of highly emissive UV-upconverting micelles with enhanced solubility.
Generalization of the encapsulation method to nineteen UV-emitting UC systems.

Main Results:

Successful fabrication of water-compatible UV-emitting UC micelles.
Achieved upconverted UV emission down to 350 nm.
Demonstrated precise photolysis of a fluorophore nearly 1 cm deep within a material.

Conclusions:

Nanoencapsulation provides a versatile method to create water-compatible UV-emitting UC systems.
This approach enables on-demand UV photon generation deep into materials.
The technology opens new avenues for spatially controlled photochemistry in UV-responsive materials.