Cesium Lead Halide Perovskite Quantum Dots as a Photoluminescence Probe for Metal Ions

Abstract

Perovskite structured CsPbX (X = Cl, Br or I) quantum dots (QDs) have attracted great attention in the past few years for appealing application potentials in photovoltaic and optoelectronic devices. In this report, the CsPbX QDs are shown to perform as a new probe for metal ions with high sensitivity, high selectivity and instant response by the quenching or enhancing of the photoluminescence (PL). Through experimental and calculation efforts, the probing mechanisms are investigated. A wide probing window for Cu and Yb ions ranging from 2 × 10 to 2 × 10 m is exhibited for CsPbBr QDs. In practice, the CsPbBr QDs are successfully applied for fast probing Cu ions in edible oils and vehicle lubricating oils with the precision consistent to the values measured by inductively coupled plasma (ICP). Thus, it provides a promising powerful tool in detecting certain metal ions in biological and industrial organic solution systems.

Stable and Highly Efficient Photocatalysis with Lead‐Free Double‐Perovskite of Cs2AgBiBr6

“…However,t he poor stability and the low photocatalytic activity of halide perovskites prevent use of these defect-tolerant materials in wide applications involving photocatalysis.H ere,a na lcohol-based photocatalytic system for dye degradation demonstrated high stability through the use of double perovskite of Cs 2 AgBiBr 6 .T he reaction rate on Cs 2 AgBiBr 6 is comparable to that on CdS,amodel inorganic semiconductor photocatalyst. The fact of fast reaction between free radicals and dye molecules indicates the unique catalytic properties of the Cs 2 AgBiBr 6 surface.D eposition of metal clusters onto Cs 2 AgBiBr 6 effectively enhances the photocatalytic activity.A lthough the stability (five consecutive photocatalytic cycles without obvious decrease of efficiency) requires further improvements,t he results indicate the significant potential of Cs 2 AgBiBr 6 -based photocatalysis.Lead halide perovskites have demonstrated great potential for optoelectronic applications such as solar cells, [1] light emitting diodes (LEDs), [2] lasers, [3] photoelectrodes, [4] and optical sensors [5] because of their high extinction coefficients, optimal band gaps,h igh photoluminescence quantum yields, and long electron/hole diffusion lengths. [6] Specifically,t he power conversion efficiencyo fl ead-based halide perovskite based solar cells has steadily risen from 3.8 [7] to 23.3 %.…”

Caesium for Perovskite Solar Cells: An Overview

“…For this purpose, Sheng et al proposed CsPbX 3 quantumd ots as Cu 2 + and Yb 3 + probe with high sensitivity,h igh selectivity and instant response through the quenching or enhancement of the photoluminescence. [265] Impressively,t he probing limit for Cu 2 + and Yb 3 + ions were as low as sub-2 10 À9 and ranged up to 2 10 À5 m.T his finding nowadays represents ac ompetitive strategy to detectm etal ions in biological and industrial organic systems, especially for those species (like rare earth ions) that are nutritionally essential and medically important forahealthy life, but only at low levels.…”

“…For this purpose, Sheng et al. proposed CsPbX 3 quantum dots as Cu 2+ and Yb 3+ probe with high sensitivity, high selectivity and instant response through the quenching or enhancement of the photoluminescence . Impressively, the probing limit for Cu 2+ and Yb 3+ ions were as low as sub‐2×10 −9 and ranged up to 2×10 −5 m .…”

Stable and Highly Efficient Photocatalysis with Lead‐Free Double‐Perovskite of Cs2AgBiBr6

“…The fact of fast reaction between free radicals and dye molecules indicates the unique catalytic properties of the Cs 2 AgBiBr 6 surface.D eposition of metal clusters onto Cs 2 AgBiBr 6 effectively enhances the photocatalytic activity.A lthough the stability (five consecutive photocatalytic cycles without obvious decrease of efficiency) requires further improvements,t he results indicate the significant potential of Cs 2 AgBiBr 6 -based photocatalysis.Lead halide perovskites have demonstrated great potential for optoelectronic applications such as solar cells, [1] light emitting diodes (LEDs), [2] lasers, [3] photoelectrodes, [4] and optical sensors [5] because of their high extinction coefficients, optimal band gaps,h igh photoluminescence quantum yields, and long electron/hole diffusion lengths. However,t he poor stability and the low photocatalytic activity of halide perovskites prevent use of these defect-tolerant materials in wide applications involving photocatalysis.H ere,a na lcohol-based photocatalytic system for dye degradation demonstrated high stability through the use of double perovskite of Cs 2 AgBiBr 6 .T he reaction rate on Cs 2 AgBiBr 6 is comparable to that on CdS,amodel inorganic semiconductor photocatalyst.…”

“…Lead halide perovskites have demonstrated great potential for optoelectronic applications such as solar cells, [1] light emitting diodes (LEDs), [2] lasers, [3] photoelectrodes, [4] and optical sensors [5] because of their high extinction coefficients, optimal band gaps,h igh photoluminescence quantum yields, and long electron/hole diffusion lengths. [6] Specifically,t he power conversion efficiencyo fl ead-based halide perovskite based solar cells has steadily risen from 3.8 [7] to 23.3 %.…”