Strategy to Construct High Thermal‐Stability Narrow‐Band Green‐Emitting Si‐CDs@MAs Phosphor for Wide‐Color‐Gamut Backlight Displays. Issue 21 (4th August 2022)

• Record Type: Journal Article
• Authors: Chen, Jianying; Zou, Xikun; Li, Wei; Zhang, Haoran; Zhang, Xuejie; Molokeev, Maxim S.; Liu, Yingliang; Lei, Bingfu
• Is Part Of: Advanced optical materials. Volume 10:Issue 21(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-04
• Subjects: carbon dots -- low thermal quenching -- narrowband -- photoluminescence -- WLED backlights; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202200851
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Developing innovative narrow‐band green‐emitting phosphors featuring low thermal quenching and eco‐friendliness for white light‐emitting diode (WLED) backlights is a pivotal challenge. Benefitting from narrowband and low toxicity of green‐emitting silanized carbon dots (Si‐CDs), an efficient confinement and protection strategy through embedding Si‐CDs in mesoporous aluminas (MAs) is proposed to construct MAs and Si‐CDs composites (Si‐CDs@MAs) with superior luminescence properties. Si‐CDs@MAs phosphor exhibits green emission at 526 nm with narrow full width at half maximum of 51 nm, zero‐thermal quenching even up to 423 K (104.1%@423 K of the emission peak intensity at 298 K), and the internal quantum efficiency of 64.46%. Compared with broad‐band yellow‐emitting solid‐state Si‐CDs (S‐Si‐CDs), the thermal stability, photostability, and water stability of Si‐CDs@MAs phosphor are remarkably improved due to surface protection. The WLED backlight is fabricated with optimized Si‐CDs@MAs phosphor, which shows high luminous efficacy of 117.43 lm W −1 and wide color gamut (107% NTSC). Furthermore, this work provides the design principles of realizing stable narrow‐band solid‐state fluorescence carbon dots, suggesting its great potential for wide‐color‐gamut display application. Abstract : A strategy for efficient protection and dispersion by embedding silanized carbon dots (Si‐CDs) in mesoporous aluminas (MAs) is proposed to construct a narrow‐band green‐emitting Si‐CDs@MAs phosphor with excellent thermal stability. Benefitting from the superior luminescence properties of Si‐CDs@MAs, the white light‐emitting diode backlight fabricated with Si‐CDs@MAs phosphor shows a high luminous efficacy of 117.43 lm W −1 and a wide color gamut (107% NTSC).