An overview of boosting lanthanide upconversion luminescence through chemical methods and physical strategies

Abstract

Lanthanide-doped upconversion nanoparticles have attracted extensive research interests due to their promising applications in various fields. However, conventional upconversion nanoparticles generally suffer from severe quenching effect, leading to extremely weak...

Co-doped NaYF4:Yb/Er/Tm upconversion luminescent coating to enhance the efficiency of photovoltaic cells

“…Previously, intensive efforts have been put to improve the upconversion luminescence intensity of NaYF 4 :Ln 3+ , such as via core–shell structure construction, 15 plasmon resonance, 16,17 dye sensitization, ion exchange and so on. 18 But the synthesis of high-quality NaYF 4 :Ln 3+ with specific sizes and morphologies in a simple way is still a challenge. 19 Impurity doping has recently been recognized as having a significant influence on the crystal phase, size and luminescence properties of NaYF 4 :Ln 3+ materials with simple synthesis.…”

Synthesis and emission dynamics of sub-3 nm single-emitter upconversion nanoparticles

“…[11][12][13][14][15] One goal of the present work is to control the crucial synthesis parameters to obtain ultrasmall (US) UCNPs with a single activator and a size close to that of the recently described giant molecular clusters. 16,17 For the optimal Tm 3+ content of 1%, 18 a single-activator UCNP has to comprise approximately 100 RE atoms, which corresponds to a diameter smaller than 2.5 nm for a typical NaREF4 unit cell volume of 0.11 nm 3 . While very efficient preparations of 10 to 40 nm UCNPs are now available, 19 little is known about ultrasmall-size UCNPs (< 10 nm), 20,21 and even less is known about UCNPs with sizes smaller than 3 nm.…”

Highly‐Doped Lanthanide‐Based Nanocrystals with Cooperative Core‐Shell Upconversion Emission for Multicomponent One‐Pot Chemical Transformations

“…Several strategies have been employed to boost the UC emission intensity such as dye-sensitized UC, core-shell architecture design, plasmon-assisted UC and host lattice distortion. [6][7][8] Recently, it was discovered that a high concentration of Yb 3+ (> 20%) enhances the absorption crosssection of UCNC while not being limited by concentration quenching. [1][2][3][9][10][11] This has led to the convenient method of using well designed UCNCs with high dopant concentrations to significantly improve the UC emission.…”