具有亮红色发光的Tm3+/Ho3+掺杂NaErF4@NaYF4核壳纳米晶的可控制备及其上转换发光性能
Controllable preparation and upconversion luminescence properties of Tm3+/Ho3+doped NaErF4@NaYF4 core-shell nanocrystals with bright red emission
尹玉 1陈杰 2刘蓉 1赵伟1
作者信息
- 1. 吉林化工学院 化学与制药工程学院,吉林 132022
- 2. 吉林化工学院 化学与制药工程学院,吉林 132022;吉林化工学院 分析测试中心,吉林 132022
- 折叠
摘要
为了获得具有红光发射的上转换纳米材料,以实现深层生物成像的应用,采用热分解法制备了一系列Tm3+、Ho3+掺杂NaErF4@NaYF4 核壳上转换纳米晶,并对其形貌、结构和发光性能进行了表征.结果表明:所制备NaErF4、NaErF4∶Tm3+和NaErF4∶Ho3+裸核均为六方相结构,呈现良好的球形形貌,平均粒径分别为 28.01 nm、23.19 nm、27.89 nm.包覆NaYF4 惰性壳层后,样品晶型没有改变,形貌变为短棒状,平均长度增大至 37.82 nm、38.51 nm、42.65 nm.在 980 nm近红外光激发下,由于Er3+的4F9/2→4I15/2 跃迁,所制备NaErF4、NaErF4∶Tm3+和NaErF4∶Ho3+裸核均呈现明显的红光发射,且包覆NaYF4 惰性壳层后,发光强度和荧光寿命都明显增加,特别是NaErF4@NaYF4 核壳样品的发光强度约是NaErF4 裸核的 1 787倍,荧光寿命达到 2.04 ms.此外,与NaErF4@NaYF4 纳米棒相比,NaErF4∶(Tm3+,Ho3+)@NaYF4 体系中的Tm3+、Ho3+充当了能量捕获中心且与Er3+之间发生能量传递,使其具有更大的红绿发射峰比值(R/G),发光颜色更趋近于红色,与色坐标(CIE)颜色区域相一致.最后,根据发光强度与激发功率的关系,详细分析了上转换纳米晶的发光增强机制及可能存在的能量传递过程.
Abstract
In order to obtain upconversion nanomaterials with bright red emission for deep bioimaging applica-tions,a series of Tm3+,Ho3+doped NaErF4@NaYF4 core-shell upconversion nanocrystals were prepared by thermal decomposition method,and their morphology,structure and luminescence properties were characterized.The results show that NaErF4,NaErF4∶Tm3+and NaErF4∶Ho3+bare core all exhibit hexagonal phase structure and good spherical morphology,with average sizes of 28.01 nm 23.19 nm,and 27.89 nm,respectively.After coating NaYF4 inert shell,the crystal phase remains unchanged,but the morphology became short rod-like,and the average length increases to 37.82 nm,38.51 nm,42.65 nm.Under the excitation of 980 nm near-infrared light,NaErF4,NaErF4∶Tm3+and NaErF4∶Ho3+show obvious red emission due to the 4F9/2→4I15/2 transition of Er3+,and the luminescence intensity and lifetime increase significantly after coating NaYF4 inert shell.In particular,the luminescence intensity of NaErF4@NaYF4 core-shell sample is about 1 787 times that of NaErF4 bare core,and the lifetime is 2.04 ms.In addition,compared with NaErF4@NaYF4,the Tm3+,Ho3+ions in the NaErF4∶(Tm3+,Ho3+)@NaYF4 system act as energy trapping centers and generate energy transfer with Er3+,resulting in a larger red-green emission peak ratio(R/G),and the luminescence color is closer to red,which is consistent with the chromaticity coordinate(CIE)color region.Finally,according to the relationship between luminescence intensity and excitation power,the upconversion luminescence enhanced mechanism and the possible energy transfer process are analyzed in detail.
关键词
上转换发光/NaErF4纳米晶/红光发射/核壳/掺杂Key words
upconversion luminescence/NaErF4 nanocrystal/red emission/core-shell/doping引用本文复制引用
基金项目
国家自然科学基金(51902125)
吉林省科技发展计划(YDZJ202101ZYTS029)
吉林市科技发展计划(20210103092)
第七批吉林省青年科技人才托举工程(QT202316)
出版年
2024
NETL
NSTL
万方数据