A Novel Multifunctional Upconversion Phosphor: Yb3+/Er3+ Codoped La2S3. Issue 6 (4th February 2014)

• Record Type: Journal Article
• Authors: Yang, Yanmin; Mi, Chao; Jiao, Fuyun; Su, Xianyuan; Li, Xiaodong; Liu, Linlin; Zhang, Jiao; Yu, Fang; Liu, Yanzhou; Mai, Yaohua; Ballato, J.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 6(2014)
• Page Start: 1769
• Page End: 1775
• Publication Date: 2014-02-04
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12822
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12822-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Yb³⁺/Er³⁺ codoped La₂S₃ upconversion (UC) phosphors have been synthesized using high‐temperature solid‐state method. Under 971‐nm excitation, the maximum luminescence power can reach 0.64 mW at the excitation power density of 16 W/cm² and an absolute power yield of 0.36% was determined by an absolute method at the excitation power density of 3 W/cm², and the quantum yield of La₂S₃:Yb³⁺, Er³⁺ (green ~0.18%, red ~0.03%, integration ~0.21) was comparable to that of NaYF₄:Yb³⁺, Er³⁺ nanocrystals (integration ~0.005–0.30). Frequency upconverted emissions from two thermally coupled excited states of Er³⁺ were recorded in the temperature range 100–900 K. The maximum sensitivity of temperature sensing is 0.0075 K⁻¹. As the excitation power density increases, the temperature of host materials rapidly rises and the top temperature can reach to 600 K. Given the intense UC emission, high sensitivity, as well as good photothermal stability, La₂S₃:Yb³⁺/Er³⁺ phosphor can become a promising composite material for photothermal ablation of cancer cells possessing the functions of temperature sensing and <italic>in vivo</italic> imaging.</p> </abstract>