A strategy to enhance the up-conversion luminescence of nanospherical, rod-like and tube-like NaYF4: Yb3+, Er3+ (Tm3+) by combining with carbon dots. Issue 4 (24th December 2020)

• Record Type: Journal Article
• Authors: Wang, Yanyan; Lu, Wei; Yue, Dan; Wang, Mengnan; Tian, Boshi; Li, Qingfeng; Hu, Bin; Wang, Zhenling; Zhang, Yilei
• Is Part Of: CrystEngComm. Volume 23:Issue 4(2021)
• Page Start: 935
• Page End: 943
• Publication Date: 2020-12-24
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce01516d
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : The luminescence enhanced strategy of combining the material with carbon dots to form CDs@NaYF4 : Yb 3+, Er 3+ (Tm 3+ ) composites is effective not only for the cubic- and hexagonal-phase materials but also for those with different morphologies. Abstract : Up-conversion luminescence materials, such as NaYF4 : Yb 3+, Er 3+ (Tm 3+ ), have very promising application prospects in the biomedical field and have attracted continuous interest in recent years. However, their low up-conversion luminescence performance is still one of the key obstacles to their application. Herein, we have developed a simple and environment-friendly strategy to enhance the up-conversion luminescence of NaYF4 : Yb 3+, Er 3+ (Tm 3+ ) by combining carbon dots (CDs), which were obtained using a wheat straw as the starting material. This luminescence enhancement strategy was effective for different doping ions (NaYF4 : Yb 3+, Er 3+ and NaYF4 : Yb 3+, Tm 3+ ), different phase structures (cubic and hexagonal) and different morphologies (nanosphere, rod-like, and tube-like). The emission intensities at 539 nm increased around 322 times for tube-like CD@NaYF4 : Yb 3+, Er 3+, 63 times for rod-like CD@NaYF4 : Yb 3+, Er 3+, and 20 times for nanospherical CD@NaYF4 : Yb 3+, Er 3+ compared with that of NaYF4 : Yb 3+, Er 3+ without CDs. The mechanism of luminescence enhancement is probably due to the decrease in defects and the electron capture by CDs and transfer to the lower energy levels of Er 3+ or Tm 3+ ions.