Manipulation of upconversion property and enhancement of sensitivity by tailoring the local structure

Abstract

Temperature sensing based on fluorescence intensity ratio (FIR) technique is one of the application fields of upconversion (UC) luminescence materials. 1-4 Lanthanide ions with two thermally coupled energy levels (TCLs), such as Er 3+ , Ho 3+ , and Tm 3+ , are widely adopted as FIR signals. 5-7 Among them, Er 3+ ion is the preferred ion due to its suitable energy gap (700-800 cm −1) of TCLs (2 H 11/2 / 4 S 3/2) and higher UC quantum efficiency. 8 Yb 3+ ion is often introduced as a sensitizer to enhance the UC emission intensity, and the application of Yb 3+ and Er 3+ co-doped UC luminescence materials in temperature sensing field attracts much attention in recent years. 9-11 Sensitivity (S A) is an

Tailoring Structural, Electronic, Optical, and Photocatalytic Properties of Y2Ti2O7 through a Passivated Codoping Approach

“…There are two nonequivalent oxygen sites: one is surrounded by two Y 3+ and two Ti 4+ , and the other is only surrounded by Y 3+ cations . So far, Y 2 Ti 2 O 7 nanocrystals or thin films have been synthesized by varied methods such as hydrothermal processes, solid-state reaction, sol–gel processes, and mechanical milling. − Due to its excellent properties, Y 2 Ti 2 O 7 has been found to be a host material for oxygen ion conductors, optical emission, solid oxide fuel cells, and photovoltaic applications, an alternative material to immobilize nuclear solid waste, and a potential photocatalyst for water splitting. − …”

Laser-Induced Tunable White Light Emission in Yb3+/Er3+/Tm3+ Ion-Doped La2Ti2O7

“…16 In the literature, studies have focused on single/codoped dilanthanum titanate systems for solid-state lighting and optical thermometry. [17][18][19][20][21][22][23][24][25] To the best of our knowledge, there are no extensive studies on upconversion white light emission for tri-doped La 2 Ti 2 O 7 .…”