Tetrahedrally coordinated rigid crystal structure enables partial self-reduction of mixed-valence europium for optical thermometric application

Abstract

Mixed-valence Europium-activated phosphors are receiving concerns in many promising fields such as lighting, anti-counterfeiting, optical recording, encryption and temperature sensing. However, it remains difficult to construct mixed-valence Europium-activated compounds due...

Influence of framework disordering on the luminescence performance of Cr3+-doped near-infrared phosphors: a case study of A3B6O14-type hosts

“…S6 †), in line with the well-known bandgap problem. [26][27][28] Therefore, further calculations of band structures and density of states were done by the more time-consuming MBJ method. Fig.…”

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

“…In particular, the special rigid structure facilitates self-reduction and allows the coexistence of heterovalent Eu 2+/3+ , e.g., Lu 2 MgA l4 SiO 12 :Eu 2+/3+ , CaBPO 5 :Eu 2+/3+ , Ba 5 SiO 4 C l6 :Eu 2+/3+ , Ca 12 Al 14 O 32 F 2 :Eu 2+/3+ , and MAl 2 Si 2 O 8 :Eu 2+/3+ . Numerous authors have suggested that the host alkaline vacancies are the primary electron source for the self-reduction of Eu 3+ . , Pan et al used an antidefect engineering strategy by introducing alkali metals to remove vacancy defects to develop high-efficiency phosphors . Han et al reported defect-induced self-activated Ba 3 BPO 7 phosphor luminescence properties and a possible mechanism .…”