How to Obtain Anti‐Thermal‐Quenching Inorganic Luminescent Materials for Light‐Emitting Diode Applications

Abstract

phosphor-converted light-emitting diodes (pc-LEDs) have been widely used in solidstate lighting, backlighting, near-infrared (NIR) light sources, etc. [1] As an important component in pc-LED devices, phosphors have been developed rapidly because of their attractive and tunable optical properties. Photoluminescence (PL) thermal stability of phosphor materials is evaluated by the thermal quenching (TQ) behavior, which is related to the electronic/crystal structure, structural rigidity, and chemical composition of phosphors. [2] To achieve high brightness, high-power LED chips that operate at high currents are usually required. In this case, a large amount of heat will lead to a high temperature on the surface of chips. This heat activates more

High-Efficiency Continuous-Luminescence-Controllable Performance and Antithermal Quenching in Bi3+-Activated Phosphors

“…This antithermal-quenching behavior is very rare in Bi 3+ -activated phosphors. It has been reported that the generation of oxygen vacancies may lead to traps, which can capture and store electrons and photons. , When at high temperature, the electrons and photons would release from traps to compensate for the energy lost in thermal quenching, resulting in an antithermal-quenching behavior . EPR analysis of the La 3 SbO 7 :0.03Bi 3+ and LaGd 2.0 SbO 7 :0.03Bi 3+ phosphors were measured to verify the existence of oxygen vacancies.…”

A new broadband near-infrared emitting Mg2Al4Si5O18:Cr3+ phosphor for night-vision imaging

“…This may be due to the non-equivalent substitution of Cr 3+ for Mg 2+ in the MAS matrix where there are oxygen vacancy defects, which contribute to enhancing the process of non-radiative transitions, resulting in the luminous intensity of MAS:Cr at 398 K being only 45.2% of that at 298 K. The thermal stability can subsequently be improved utilizing charge compensation. 52…”

Tuning of the thermal quenching performance of Bi3+-doped scheelite Ca(Mo/W)O4 solid solution phosphors

“…Zhiguo Xia et al 34 enhanced the non-radiative relaxation of Cr 3+ by increasing the structural rigidity and local symmetry through Al/Sc substitution, thus suppressing it. Peipei Dang et al 35 reported that the review was done by seven different strategies to obtain phosphors with anti-thermal-quenching performance. However, the aforementioned studies are limited to specific substrates and structures which are not common, so it is difficult to generalize their tactics.…”