Next-Generation Short-Wave Infrared LED Phosphors Based on Chromium Doped Rare Earth Sulfides
Next-Generation Short-Wave Infrared LED Phosphors Based on Chromium Doped Rare Earth Sulfides
研究概述
以强共价、低声子能量的稀土硫化物NaLnS2为基体引入Cr³⁺，获得980–1080 nm可调短波红外发光。NaLuS2:Cr³⁺外量子效率61.55%，NaGdS2:Cr³⁺在1080 nm达48.55%；封装LED在350 mA下输出169.2 mW，并演示掌静脉识别及无损检测。
谱图与表征信息
FIGURE 1 Crystal structures and micromorphology. (a) XRD patterns of NaLnS2 (Ln = Lu, Y, Gd) and magnified XRD patterns from 31◦to 33◦. (b) Crystal structure of NaLnS2 (Ln = Lu, Y, Gd). (c) The unit cell parameters change diagram of Ln - cation substitution in NaLnS2 (Ln = Lu, Y, Gd). (d) Cr K-edge XANES spectra of NaLnS2: 0.02Cr3+ (Ln = Lu, Y, Gd). (e) Corresponding FT-EXAFS spectra of the NaLuS2: 0.02Cr3+. (f) EPR spectra of NaLnS2: 0.02Cr3+ (Ln = Lu, Y, Gd) samples recorded at room temperature.