CsPbBr(Cl,I)3 quantum dots in fluorophosphate glasses

TL;DR

This study reports the first synthesis of CsPbX_3 quantum dots within fluorophosphate glasses, demonstrating controlled formation, high photoluminescence efficiency, and the coexistence of multiple quantum dot types.

Contribution

It introduces a novel method for embedding CsPbX_3 quantum dots in fluorophosphate glasses with controlled size and phase, advancing materials for optoelectronic applications.

Findings

Quantum dots formed in cubic and orthorhombic modifications.

Photoluminescence quantum yield of 45-50%.

Simultaneous formation of multiple quantum dot types.

Abstract

For the first time the quantum dots CsPbX_3 (X=Cl, Br, I) in the fluorophosphate glasses were prepared. The samples were precipitated by two methods:(i) through self-crystallization during cooling of the glass melt and (ii) heat treatment of the glass. Controlled formation of CsPbX_3 quantum dots was realized by adjustment of cooling rate and heat-treatment conditions. The X-ray diffraction data was confirmed CsPbCl_3(Br_3, I_3) quantum dots formation. It was shown that, CsPbX_3 (X=Cl, I) quantum dots are formed in a cubic modification, while CsPbBr_3 in orthorhombic one. The photoluminescence of quantum dots have high intensity with quantum yield 45-50% and narrow band emission. The combined introduction of two anions (Cl/Br and Br/I) led to the simultaneous formation of two types of quantum dots, and indicates the difficulty of the anion exchange.