JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2673-2683
·
IF 2.302
Huang Zhangyu,Yi Mengji,Gao Huiping,Zhang Zhenlong,Mao Yanli
A strategy is demonstrated for simultaneous size and color tuning of KZnF 3 :Yb 3+ /Er 3+ nanocrystals through transition metal Mn 2+ doping. The experimental results indicate that the introduction of Mn 2+ into the KZnF 3 :Yb 3+ /Er 3+ reaction system facilitates the decrease of the crystal size. Moreover, in the case of a high concentration of Mn 2+ doping, the downshifting (DS) and upconversion (UC) luminescence all show a single red band emission. In this work, we mainly investigate the DS and UC energy transfer process among Mn 2+ /Yb 3+ /Er 3+ in KZnF 3 nanocrystals by the detection and analysis of the absorption, excitation, emission, and transient fluorescence spectra. The results show that both Mn 2+ and Yb 3+ ions can decrease the green emission while improving the red luminescence of Er 3+ . This DS and UC single red color tuning is significant for the application of nanoparticles in light conversion, biological labeling, or plant photosynthesis.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2023
·Vol. 10
·期 11
·116202
·
IF 2.3
Yifan Yang,Yongqi Zhu,Shuang Wu,Xinyue Li,Qinan Mao,Yifan Chen,Jiasong Zhong,Yiwen Zhu
In this study, a series of near-infrared (NIR) KZnF3:Cr3+ phosphors was prepared by different chromium sources using a HF-free hydrothermal method. The influence of different chromium sources on the crystal structure, morphology, and luminescence properties of Cr3+-doped KZnF3 phosphors were systematically investigated. The results showed that the chromium source changed from CrF3·xH2O to (NH4)3CrF6 and leaded to an increased crystal field, resulting in a blue shift of the emission peak position from 803 nm to 753 nm, accompanied by the full-width half maximum (FWHM) reduced from 140 nm to 122 nm. Moreover, KZnF3:0.03Cr3+ (CrF3·xH2O) and KZnF3:0.03Cr3+ ((NH4)3CrF6) phosphors maintained 58% and 87% of their initial room-temperature intensity at 423 K, respectively. These results indicated that altering the synthetic raw materials provided new insights for designing NIR phosphors with highly thermal stability.
研究领域:
材料科学
·
光学材料
·
荧光粉技术
·
发光材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2013
·Vol. 1
·期 27
·4209-4215
·
IF 0
En-Hai Song,Sha Ding,Ming Wu,Shi Ye,Fen Xiao,Guo-Ping Dong,Qin-Yuan Zhang
Temperature-tunable intense yellow upconversion luminescence has been demonstrated in perovskite nanocrystals KZnF3:Yb3+,Mn2+ upon excitation with a 976 nm laser diode. The broad yellow luminescence band is centered at 585 nm and identified as the 4T1g(G) → 6A1g (S) transition of Mn2+. An upconversion luminescence mechanism based on exchange coupled Yb3+–Mn2+ dimer is proposed and the upconversion process consists of a sequence of ground state absorption (GSA)/excited-state absorption (ESA) steps. To understand thermal quenching behavior, temperature dependent upconversion luminescence of KZnF3:Yb3+,Mn2+ during heating and cooling cycles have been investigated. Results show the yellow upconversion luminescence can be seen by the naked eyes at temperatures up to 573 K and the thermal quenching is reversible. The intense yellow upconversion nanocrystals KZnF3:Yb3+,Mn2+ might find potential applications in the fields of lighting, temperature sensing, biomedical imaging and solid state lasers.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
发光学
·
光子学
✓ 已验证
DOI
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 40
·9598-9607
·
IF 5.066
M. Wu,X. F. Jiang,E. H. Song,J. Su,Z. T. Chen,W. B. Dai,S. Ye,Q. Y. Zhang
Successful upconversion (UC) tuning from multi-bands to one single red band from Er3+ ions was realized in cubic perovskite ABF3:Yb3+/Er3+ (A = K, Cs; B = Zn, Cd) through Mn2+ doping. Based on UC emission spectra and decay kinetics of KZnF3:Yb3+/Er3+ with different Mn2+ contents, a bidirectional energy transfer process between Mn2+ and Er3+ ions was confirmed to explain the UC tuning mechanism. More importantly, we studied the influence of the Mn2+ energy level position on the UC properties for Er3+ in ABF3 hosts. Interestingly, great enhancement of green UC emissions was observed for Er3+ ions in KCdF3 and CsCdF3 hosts upon Mn2+ doping. Comparison of UC emissions and lifetimes of Er3+ ions in the three materials was carried out to probe the different UC processes in ABF3 (A = K, Cs; B = Zn, Cd) hosts. The different energy transfer mechanism between Mn2+ and Er3+, which is affected by the Mn2+ energy level position, was proposed to explain the UC difference in the three matrices. This research convincingly confirmed the occurrence of energy transfer between Er3+ and Mn2+ ions and provided deep insights into the importance of the Mn2+ energy level position in tuning the UC properties of Er3+ in diverse hosts, while allowing us to better control the UC properties through Mn2+ doping.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7508-7519
·
IF 4.22
Yang Xu,Zhao Xiaofan,Wang Rui,Yang Zining,Song Changqing,Yuan Maohui,Han Kai,Lan Sheng,Wang Hongyan,Xu Xiaojun
Exploiting the optical/magnetic bifunctional upconversion nanoparticles (UCNPs) with small size has become a trend in the high-resolution biological imaging. Here, we report the simultaneous size manipulation and color tuning in Er 3+ -sensitized perovskite KZnF 3 UCNPs via Mn 2+ doping. It was found that the introduction of Mn 2+ into the KZnF 3 host matrix facilitates the reduction of the nanoparticle size (from 1 μm to 50 nm). Under the excitation of both 980 and 808 nm continuous wave (CW) laser, these KZnF 3 :Er 3+ /Mn 2+ (1/x mol%) UCNPs can efficiently generate tunable upconversion luminescence (UCL) and achieve pure red UCL as the Mn 2+ concentration reaches 30 mol%. It is suggested that the energy transfer (ET) processes between Er 3+ and Mn 2+ ions contribute to the single-band red UC emission, which was well supported by investigating the dependence of UCL intensity on the pump power and the decay lifetimes of 4 S 3/2 and 4 F 9/2 states of Er 3+ ions. In addition, the KZnF 3 :Er 3+ /Mn 2+ UCNPs have been used as the T 1 -weighted magnetic resonance imaging (MRI) agents, which exhibits a high optical contrast with the background. These features make the KZnF 3 :Er 3+ /Mn 2+ UCNPs promising for excellent dual-modal agents in UCL imaging and MRI.
研究领域:
生物医学工程
·
材料科学
·
光学成像
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Z.T. Chen,E.H. Song,M. Wu,S. Ding,S. Ye,Q.Y. Zhang
In contrast to common multiple upconversion (UC) emission characteristic from Ho 3+ , intense single-band red UC emission is realized in perovskite KZnF 3 : Mn 2+ ,Yb 3+ ,Ho 3+ nanocrystals via controlling the doping concentration ratio of Mn 2+ to Ho 3+ . Based on stokes emission, UC luminescence and energy levels of Mn 2+ and Ho 3+ , a bidirectional energy transfer from the 5 S 2 / 5 F 4 state of Ho 3+ to the 4 T 1 ( 4 G) state of Mn 2+ or | F 2 7 / 2 , T 4 1 ( G 4 ) 〉 state of Yb 3+ -Mn 2+ dimer, then to 5 F 5 state of Ho 3+ (ET2) is provided to explain the unique UC emission behaviors of KZnF 3 : Mn 2+ ,Yb 3+ ,Ho 3+ . The effects of dopant concentration on the UC luminescence properties of KZnF 3 : Mn 2+ , Yb 3+ , Ho 3+ is investigated in detail. Analysis of the dominant red UC emission of KZnF 3 : Mn 2+ , Yb 3+ , Ho 3+ under different laser pulse width excitation indicates the energy transfer process . The special temperature dependent UC luminescence for Mn 2+ doped and Mn 2+ freely doped KZnF 3 :Yb 3+ , Ho 3+ further confirm the bidirectional energy transfer mechanism in the UC process. The study of these single-band red UC nanocrystals provides deep insights into the understanding of bidirectional energy transfer in UC mechanism, offering the possibility for applications in biolabels and bioimaging.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）