Robust CsPbBr3 and CdSe/Dy3++CdSe quantum dot doped glass nanocomposite hybrid coupling as color converter for solid-state lighting applications

CsPbX3 (X = Br-, Cl-, I-) and IIB-VIA group quantum dots (QDs) exhibit great potential for diverse opto-electronic applications due to their outstanding photoluminescence features. However, poor long-term stability limits their integration into practical applications. Although various surface modification and encapsulation methods have been proposed to increase their durability, desired stability values along with favorable emission properties could not be achieved yet. In this work, controlled crystallization of CsPbBr3 and CdSe QDs are realized separately in a specially tailored silicate glass matrix to obtain quantum dot doped glass nanocomposite (GNC) layers showing typical bright green emission and broadband emission that covers red end of the visible spectrum, respectively. Two alternative white LED devices are constructed as a proof-of-concept by coupling CsPbBr3 doped layer with CdSe and Dy3++CdSe doped layers on top of a blue LED chip to demonstrate excellent color conversion performance and challenging color rendering index values up to 85. CsPbBr 3 doped GNC layer exhibits photo-luminescence quantum yield (PLQY) up to 40.44%, while PLQY of CdSe doped layer is enhanced up to 18.68% via incorporation of Dy3+ ions. PL properties of GNCs are reversible up to 275 degrees C and stable after 60 days of immersion in water or under 442 nm laser irradiation (5 W/cm(2)) up to 30 min. Promising thermal, chemical, and photo stability properties reveal that hybrid coupling of GNCs exhibit high potential to be used as color convertors in solid-state lighting applications.

Automated summary

This study demonstrates controlled crystallization of CsPbBr3 and CdSe quantum dots in a specially tailored silicate glass matrix, resulting in quantum dot doped glass nanocomposite layers. Two white LED devices are constructed using different combinations, showing excellent color conversion performance and high color rendering index values. The hybrid coupling of quantum dots exhibits high potential to be used as color converters in solid-state lighting applications.