TY - JOUR
T1 - Strong upconversion emission in CsPbBr 3 perovskite quantum dots through efficient BaYF 5 :Yb,Ln sensitization
AU - Zeng, Min
AU - Singh, Shalini
AU - Hens, Zeger
AU - Liu, Jing
AU - Artizzu, Flavia
AU - Van Deun, Rik
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2019
Y1 - 2019
N2 - Owing to their remarkable optical properties, all-inorganic cesium lead halide perovskite CsPbX 3 (X = Br, Cl, and I) quantum dots (QDs) have emerged as promising materials for a variety of applications, such as solar cells and light-emitting diodes. However, these perovskite QDs can only be excited under short-wavelength light with high power below 600 nm, which limits their applications. Herein, we demonstrate an effective strategy to realize near-infrared (NIR) pumping for CsPbBr 3 QDs through energy transfer from lanthanide-doped upconversion nanoparticles (UCNPs). UCNP/QD pairs with different molar ratios were synthesized by an in situ growth method. Transmission electron microscopy images show that the configuration of the assembly is dependent on the molar ratio of the two units which are distributed homogenously with high surface contact. A high energy transfer efficiency ∼100% from the UCNP donors to the QD acceptors is achieved, leading to intense green emission from the perovskite CsPbBr 3 QDs under NIR laser light even in a liquid suspension. Additionally, the high photostability of CsPbBr 3 QDs under NIR irradiation suggests that this strategy can be a critical step for the development of perovskite-based functional emitters or devices with long-term operational stability.
AB - Owing to their remarkable optical properties, all-inorganic cesium lead halide perovskite CsPbX 3 (X = Br, Cl, and I) quantum dots (QDs) have emerged as promising materials for a variety of applications, such as solar cells and light-emitting diodes. However, these perovskite QDs can only be excited under short-wavelength light with high power below 600 nm, which limits their applications. Herein, we demonstrate an effective strategy to realize near-infrared (NIR) pumping for CsPbBr 3 QDs through energy transfer from lanthanide-doped upconversion nanoparticles (UCNPs). UCNP/QD pairs with different molar ratios were synthesized by an in situ growth method. Transmission electron microscopy images show that the configuration of the assembly is dependent on the molar ratio of the two units which are distributed homogenously with high surface contact. A high energy transfer efficiency ∼100% from the UCNP donors to the QD acceptors is achieved, leading to intense green emission from the perovskite CsPbBr 3 QDs under NIR laser light even in a liquid suspension. Additionally, the high photostability of CsPbBr 3 QDs under NIR irradiation suggests that this strategy can be a critical step for the development of perovskite-based functional emitters or devices with long-term operational stability.
UR - http://www.scopus.com/inward/record.url?scp=85061638965&partnerID=8YFLogxK
U2 - 10.1039/c8tc06063k
DO - 10.1039/c8tc06063k
M3 - Article
AN - SCOPUS:85061638965
SN - 2050-7534
VL - 7
SP - 2014
EP - 2021
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 7
ER -