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The development of novel narrow-band emitting phosphors with high efficiency and stability is of great significance for WLED backlights. In recent years, the research on Bi3+-activated narrow-band emitting phosphors has gained significant attention for developing novel phosphors for WLED backlight applications. This Frontiers article presents recent advances in Bi3+-activated narrow-band emitting phosphors, encompassing their coordination environment and photoluminescence properties. The latest advancements in Bi3+-activated narrow-band emitting phosphors are categorized into four types based on host materials: germanate, silicate, borate, and other hosts. Additionally, detailed discussions are provided on the challenges associated with developing novel Bi3+-activated narrow-band emitting phosphors and potential research directions for future work. Overall, the Bi3+-activated narrow-band emitting phosphors have demonstrated great potential for WLED backlights; however, significant efforts are still required to enhance their comprehensive performance in order to meet practical application requirements. [ABSTRACT FROM AUTHOR]

Despite extensive research on the photoluminescence properties of Bi3+ ions, the origins of their emission and excitation bands remain elusive. Herein, we present a comprehensive analysis of the photoluminescence properties of Bi3+-activated LuXnGaO4 (Xn = Mg, Zn), elucidating the underlying factors governing the intra-ionic and extra-ionic electronic transitions. By integrating crystal structure data and spectroscopic data analyses with semi-empirical formula calculations, the origins of excitation and emission states were elucidated. Moreover, the impact of alterations in chemical surroundings on the luminescence of Bi3+ was investigated. Both LuXnGaO4:Bi3+ phosphors exhibit three excitation peaks in the near ultraviolet region and display a broadband yellow emission. However, the luminous behavior of LuMgGaO4:Bi3+ and LuZnGaO4:Bi3+ differs due to variations in the band gap, bond length and neighboring atoms. It is anticipated that the investigation of Bi3+-activated gallates presents a promising avenue for advancing wide-band and long-wavelength emitting phosphors. [ABSTRACT FROM AUTHOR]

The development of novel narrow-band emitting phosphors with high efficiency and stability is of great significance for WLED backlights. In recent years, the research on Bi 3+ -activated narrow-band emitting phosphors has gained significant attention for developing novel phosphors for WLED backlight applications. This Frontiers article presents recent advances in Bi 3+ -activated narrow-band emitting phosphors, encompassing their coordination environment and photoluminescence properties. The latest advancements in Bi 3+ -activated narrow-band emitting phosphors are categorized into four types based on host materials: germanate, silicate, borate, and other hosts. Additionally, detailed discussions are provided on the challenges associated with developing novel Bi 3+ -activated narrow-band emitting phosphors and potential research directions for future work. Overall, the Bi 3+ -activated narrow-band emitting phosphors have demonstrated great potential for WLED backlights; however, significant efforts are still required to enhance their comprehensive performance in order to meet practical application requirements.

Despite extensive research on the photoluminescence properties of Bi 3+ ions, the origins of their emission and excitation bands remain elusive. Herein, we present a comprehensive analysis of the photoluminescence properties of Bi 3+ -activated LuXnGaO 4 (Xn = Mg, Zn), elucidating the underlying factors governing the intra-ionic and extra-ionic electronic transitions. By integrating crystal structure data and spectroscopic data analyses with semi-empirical formula calculations, the origins of excitation and emission states were elucidated. Moreover, the impact of alterations in chemical surroundings on the luminescence of Bi 3+ was investigated. Both LuXnGaO 4 :Bi 3+ phosphors exhibit three excitation peaks in the near ultraviolet region and display a broadband yellow emission. However, the luminous behavior of LuMgGaO 4 :Bi 3+ and LuZnGaO 4 :Bi 3+ differs due to variations in the band gap, bond length and neighboring atoms. It is anticipated that the investigation of Bi 3+ -activated gallates presents a promising avenue for advancing wide-band and long-wavelength emitting phosphors.

Developing optical thermometer phosphors with high sensitivity, high signal discriminability and strong fluorescence intensity is ongoing. A dual-emitting thermochromic phosphor, LiScSiO 4 :Ce 3+ , Tb 3+ , was successfully synthesized via solid-state reaction method. The crystal structure, electronic structure, luminescent performance and thermal luminescence behaviors as well as the luminescence mechanism of LiScSiO 4 :Ce 3+ , Tb 3+ were systematically investigated. Due to the energy transfer and different thermoluminescence behaviors between Ce 3+ and Tb 3+ , high relative sensitivity (2.2 % K -1 @473 K), excellent signal discriminability (5747 cm -1 ), outstanding temperature resolution (0.067 K) and good repeatability, as well as efficient emission at high temperatures were achieved based on the fluorescence intensity ratio of Ce 3+ and Tb 3+ , indicating its potential in ratiometric optical thermometer. Moreover, the excellent visualizing thermochromic enable LiScSiO 4 :Ce 3+ , Tb 3+ to be used as safety sign in variable temperature environment to monitor temperature distribution., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier B.V. All rights reserved.)