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Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

机译:通过级联光学场调制策略促进选择性多光谱窄带近红外光电探测的巨大上转换发光提高

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摘要

a TEM image of NaYF4:20% Yb3+, 2%Er3+@NaYF4@NaYF4:20% Yb3+, 20% Nd3+, 0.2% Tm3+ CSS UCNCs. b Line-scan elemental mapping curves of a single NaYF4:20% Yb3+, 2% Er3+@NaYF4@NaYF4:20% Yb3+, 20% Nd3+, 0.2% Tm3+ CSS NC. c Upconversion emission spectra of CSS UCNCs recorded under 808, 980 and 1540 nm laser excitation. (Inset) Corresponding photos of the CSS UCNC films upon illumination with three kinds of lasers. d Energy-transfer upconversion processes in Nd3+-, Yb3+-, Er3+-, and Tm3+-codoped CSS UCNCs
机译:NayF4:20%YB3 +,2%ER3 + @ NayF4:20%YB3 +,20%ND3 +,0.2%TM3 + CSS UCNC的TEM图像。 B单个NayF4:20%YB3 +,2%ER3 + @ NayF4:20%YB3 +,20%ND3 +,0.2%TM3 +,0.2%TM3 + CSS NC的单次NayF4:20%YB3 +,2%ER3 +,2%ER3 +。 C在808,980和1540nm激光激发下记录的CSS UCNC的C增强发射光谱。 (插图)CSS UCNC薄膜的相应照片,用三种激光器照明。 D在ND3 + - ,YB3 + - ,ER3 + - ,和TM3 + -Codoped CSS UCNC中的能量传递高度增强过程

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