Y₂O₃:Eu³⁺@SiO₂ nanocomposites as a convertor for a broadband solar‐blind UV photodetector

Abstract

Core–shell nanocomposites have attracted extensive attention in the photoelectric field because of their improved material properties and the combination of multiple functions. Particularly, these nanocomposites exhibit tunable structure and excellent optical properties. Inspired by these unique features, a novel optically active nanocomposites, Y2O3:Eu3+@SiO2 with a core–shell structure, is designed and fabricated by a hydrothermal method and electrophoretic deposition. In addition, the Y2O3:Eu3+@SiO2 composite film is also successfully developed and applied as a spectral down‐converter in the solar‐blind ultraviolet (UV) waveband region of 200–280 nm. Moreover, a broadband solar‐blind UV photodetector device is elaborated and a notable enhancement in the UV sensitivity is achieved. The findings not only provide a new idea for the development of broadband solar‐blind UV photodetector but also extended the application range of core–shell nanocomposites in photonics.

Photoelectric properties of glass-ceramics containing KTb2F7 nanocrystals for UV detection

“…The photovoltage of the silicon photoresistor covered with the convertor GC under pulse UV excitation is recorded by an oscilloscope. 29,38,39…”

“…So far, a variety of uorosilicate GCs have been designed for achieving high-efficiency luminescence. [22][23][24][25][26][27][28][29] For example, Meyneng et al proposed an optimized SiO 2 -Al 2 O 3 -YLiF 4 system and obtained GCs containing YF 3 or YLiF 4 phase with controllable transparency through controlled heat treatment. 30 By using the same meltquenching method, Gorni et al prepared transparent oxy-uoride GCs doped with Nd 3+ and Er 3+ ions.…”