Synthesis And Photoelectric Properties Of Erbium Chloride Borate Single Crystal Nanobelts

In recent years,rare earth elements have played an important role in the development of optical information technology due to their abundant luminous properties and optical gain performance of near-infrared communication band.Rare earth doped semiconductors,rare earth compounds and other material systems have become a treasure-house of new and high-performance luminescent materials.Compared with the rare earth doped semiconductor materials,the rare earth compound materials have extremely high ion concentration and relatively fixed position in the lattice,which greatly improves the optical gain performance of the materials in the near-infrared band while avoiding ion agglomeration caused by high concentration.As a result,rare earth compound materials,especially Er³⁺compound materials,have attracted great attention from scientists.For example,erbium silicate nanowires and other micro-nano structures have been used to achieve high-efficiency optical amplification in near infrared band.Compared with erbium silicate micro-nano structure,borate structure is suitable for exciting light sources with different matrix materials due to its diversity of matrix structure composition and abundant B-O coordination modes.Besides,because of its large phonon energy,it is expected to inhibit the upconversion luminescence of erbium ions and promote the luminescence efficiency in near infrared band.It has broad application prospects in near infrared optical communication,display,communication,lighting and other fields.Erbium borate single crystal nanoribbons were synthesized by improved chemical vapor deposition?CVD?method,and the morphology,element composition and structural characteristics of the samples were characterized and analyzed.The optical properties of the samples were studied by near-field optical microscopy and near-infrared PL measurement system.A novel CdS-ECB nanoribbon hybrid waveguide photodetector was constructed and its photoelectric characteristics were tested.Several research results obtained in this paper are mainly reflected in the following two aspects:1.A new erbium compound,erbium borate chloride?ECB?nanoribbon,was successfully synthesized by improved CVD method.These nanoribbons have smooth surface,high erbium ion concentration and good single-crystal structure.The up-conversion luminescence and near-infrared luminescence?1.54 um?characteristics of ECB nanoribbons have been studied.These nanoribbons are one of the most promising materials for preparing high-gain optical amplifiers,modulators and detectors.2.A CdS-ECB nanoribbon hybrid waveguide photodetector was fabricated.Due to the effective energy transfer from the ECB waveguide cavity to the CdS nanoribbon,the structure exhibits remarkable light response characteristics in the near infrared band.Compared with the pure CdS nanoribbons,the near i nfrared optical response of the hybrid devices has been significantly improved.At the same time,the photodetector also exhibits excellent optical switching characteristics,and has a certain potential application value in the field of high-performance and integrated photoelectric devices.