A highly efficient and thermally stable broadband Cr3+-activated double borate phosphor for near-infrared light-emitting diodes. Issue 1 (26th November 2020)

• Record Type: Journal Article
• Authors: Huang, Decai; Zhu, Haomiao; Deng, Zhonghua; Yang, Hongyi; Hu, Jie; Liang, Sisi; Chen, Dejian; Ma, En; Guo, Wang
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 1(2021)
• Page Start: 164
• Page End: 172
• Publication Date: 2020-11-26
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc04803h
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : GdAl3 (BO3 )4 :Cr 3+ is used to fabricate a NIR-pc-LED that shows promise for plant lighting and applications in the nondestructive analysis of agricultural products. Abstract : Highly efficient and thermally stable broadband near-infrared (NIR) phosphors are urgently required for phosphor-converted light-emitting diodes (pc-LEDs), which are compact, low cost and promising for applications such as food analysis and agricultural science. Herein, a NIR phosphor, GdAl3 (BO3 )4 :Cr 3+ (GAB:Cr 3+ ), with high emission efficiency and excellent thermal stability is presented. Under blue light excitation, GAB:Cr 3+ shows a broad emission band covering 650–1000 nm with a full width at half maximum of ∼140 nm. Particularly, the 1.0 at% Cr 3+ doped sample exhibits a photoluminescence (PL) quantum yield as high as 91%, and no decline of the PL intensity is observed even when the temperature is raised from 298 to 423 K. By combining the GAB:Cr 3+ phosphor with a commercial blue LED chip, a high-performance NIR pc-LED is fabricated with a NIR radiant flux of 81 mW under a drive current of 350 mA. Furthermore, an aging test was performed on this device at 85 °C and 85% humidity for 480 h, and the radiant flux retained up to 95% of its initial value, which is comparable to the commercial phosphors. These results suggest that GAB:Cr 3+ is a promising candidate for broadband pc-LEDs in NIR spectroscopy applications.