Dy³⁺doped (K,Na)NbO₃-based multifunctional ceramics for achieving enhanced temperature-stable piezoelectricity and non-contact optical temperature sensing performance

Abstract

There exists a huge demand for multifunctional materials to keep pace with the development of the next generation of modern electronics featured with high integration, good reliability and multifunction. Herein,...

The Integration of Two-Dimensional Materials and Ferroelectrics for Device Applications

“…Among the 20 types of point groups allowing the existence of the piezoelectric effect, there are 10 kinds of point groups that can endow the crystals of these point groups with specific polarization axes . A temperature increase can reduce the electric dipole moment of crystals with these point groups, resulting in changes in the external charge of crystals. , Thus, these crystals are called pyroelectrics. The polarization of some crystals along the polar axis can also be reoriented by an applied electric field, and these crystals are well-known as ferroelectric crystals.…”

“…145 A temperature increase can reduce the electric dipole moment of crystals with these point groups, resulting in changes in the external charge of crystals. 144,146 Thus, these crystals are called pyroelectrics. The polarization of some crystals along the polar axis can also be reoriented by an applied electric field, and these crystals are well-known as ferroelectric crystals.…”

Lanthanide-doped lead-free double perovskite La2MgTiO6 as ultra-bright multicolour LEDs and novel self-calibrating partition optical thermometer

“…LIR technology is based on the repopulation of electrons in TCLs or non-TCLs in Ln 3+ ions or transition metal ions. [41][42][43] As we all know, it is more difficult for TCLs to distinguish between the two emission bands due to the relatively small ΔE (200-2000 cm −1 ). 44 Meanwhile, according to the sensitivity formula (S r = ΔE/kT 2 ), the small ΔE of TCLs greatly restricts the emergence of high-sensitivity thermometers.…”

Study on a Highly Thermostable Dy3+-Activated Borophosphate Phosphor

“…Hereby, constructing a highly thermostable LED phosphor is critical. On the other hand, based on the temperature-sensitive optical properties of phosphor, noncontact optical temperature sensing technologies are increasingly developed due to the prospective utilizations of daily life, medical practice, and scientific research. − Typically, fluorescence intensity ratio (FIR)-based optical thermometer is widely concerned for its exceptional precision and fast response. − The FIR can be achieved by exploiting the nonthermal coupling energy levels (NTCEL) for emitting centers, demanding a significant temperature-related intensity variation difference between the two emissions. This also brings low luminescence thermostability.…”