Synthesis and near-infrared quantum cutting of Tb 3+ , Yb 3+ codoped GdBa 3 B 9 O 18 phosphors

Micro & nano letters

article

Tiezheng Liu¹  Juan Cai³  Yan Cui¹  Zhe Song¹  Ming He¹  Hongwei Zhao¹  Zhihua Zhang¹  Hualong Tao¹ 

[1] Liaoning Key Materials Laboratory for Railway, School of Materials Science and Engineering, Dalian Jiaotong University;School of Materials Science and Engineering, Liaoning University of Technology;School of Physics and Electronic Technology, Liaoning Normal University

关键词: phosphors;    terbium;    ytterbium;    gadolinium compounds;    barium compounds;    high-temperature effects;    doping profiles;    fluorescence;    crystal growth from solid;    near-infrared quantum cutting;    codoped phosphors;    high-temperature solid-state method;    visible emission intensity;    infrared range;    cooperative energy transfer;    emission spectra;    luminescence life time measurements;    intrinsic quantum efficiency;    GdBa3B9O18Tb;    Yb;   

DOI  :  10.1049/mnl.2017.0382

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Background:  There is global concern regarding the spread of antimicrobial resistance in bacteria and fungi. Oncology patients are at particular risk of infections with multidrug resistant organisms. These patients require urgent initiation of empiric antimicrobial therapy when presenting with neutropenic fever. Currently, piperacillin-tazobactam and amikacin with or without vancomycin is the treatment of choice in the unit. Aim:  The purpose of this study was to develop a cumulative antibiogram for the paediatric oncology unit at Charlotte Maxeke Johannesburg Academic Hospital (CMJAH) to guide empiric treatment recommendations for patients presenting with suspected bacterial or fungal infection. Setting:  Tertiary-level paediatric oncology unit. Methods:  A retrospective observational analysis was performed of bacterial and fungal antimicrobial susceptibility data extracted from the microbiology laboratory information system for clinical specimens submitted from the paediatric oncology unit at CMJAH. Data was analysed for the period January 2015 to May 2018. In addition, analysis and comparison of two 17-month time periods was performed in order to elicit any changes over time. Results:   Klebsiella pneumoniae  and  Escherichia coli  were the most common gram-negative organisms isolated. Twenty-one percent of Enterobacteriaceae showed resistance to third generation cephalosporins and 9% to carbapenems. Rates of carbapenem-resistant isolates decreased significantly over time. Adding amikacin to piperacillin-tazobactam significantly increased bacterial coverage. Coagulase-negative staphylococci and  Candida parapsilosis  were the most common gram-positive and fungal isolates recovered during the study. Conclusion:  The results support the continued use of piperacillin-tazobactam and amikacin for paediatric oncology patients presenting with neutropenic fever in this unit. Antibiograms are an important component of antimicrobial stewardship in conjunction with efficient infection prevention and control measures.

【 授权许可】

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