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首页> 外文期刊>Chemistry: A European journal >Controllable Red, Green, Blue (RGB) and Bright White Upconversion Luminescence of Lu2O3:Yb3+/Er3+/Tm3+ Nanocrystals through Single Laser Excitation at 980 nm
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Controllable Red, Green, Blue (RGB) and Bright White Upconversion Luminescence of Lu2O3:Yb3+/Er3+/Tm3+ Nanocrystals through Single Laser Excitation at 980 nm

机译：Lu2O3：Yb3 + / Er3 + / Tm3 +纳米晶体通过980 nm单激光激发可控的红，绿，蓝（RGB）和亮白色上转换发光

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摘要

Lu2O3:Yb3+/Er3+/Tm3+ nanocrystals have been successfully synthesized by a solvothermal process followed by a subsequent heat treatment at 800 degrees C. Powder X-ray diffraction, transmission electron microscopy, upconversion photoluminescence spectra, and kinetic decay were used to characterize the samples. Under single-wavelength diode laser excitation of 980 nm, the bright blue emissions of Lu2O3:Yb3+, Tm3+ nanocrystals near 477 and 490 nm were observed due to the (1)G(4)-> H-3(6) transition of Tm3+. The bright green UC emissions of Lu2O3:Er3+ nanocrystals appeared near 540 and 565 nm were observed and assigned to the H-2(11/2)-> I-4(15/2) and S-4(3/2)-> I-4(15/2) transitions, respectively, of Er3+. The ratio of the intensity of green luminescence to that of red luminescence decreases with an increase of concentration of Yb3+ in Lu2O3:Er3+ nanocrystals. In Sufficient quantities of Yb3+ with resprct to Er3+, the bright red UC emission of Lu2O3:Yb3+/Er3+ centered at 662 tint was predominant, due to the F-4(9/2)-> I-4(15/2) transition of Er3+. Based on the generation of red, green, and blue emissions in the different doped Lu2O3:RE3+ nanocrystals, it is possible to produce the luminescence with a wide spectrum of colors, including white, by the appropriate doping of Yb3+, Tm3+, and Er3+ in the present Lu2O3 nanocrystals. Namely, Lu2O3:3%Yb3+/0.2% Tm3+/0.4% Er3+ nanocrystals show suitable intensities of blue, green, and red (RGB) emission, resulting in the production of perfect and bright white light with CIE-x=0.3456 and CIE-y=0.3179, which is very close to the standard equal energy white light illuminate (x=0.33, y=0.33). Because of abundant luminescent colors from RGB to white in Lu2O3:Yb3+/Er3+/Tm3+ nanocrystals under 980 nm laser diode (LD) excitation, they can potentially be used as fluorophores in the field of color displays, back light, UC lasers, photonics, and biomedicine.
机译：Lu2O3：Yb3 + / Er3 + / Tm3 +纳米晶体已经通过溶剂热法成功地合成，随后在800摄氏度下进行了热处理。粉末X射线衍射，透射电子显微镜，上转换光致发光光谱和动力学衰减被用来表征样品。在980 nm的单波长二极管激光激发下，由于Tm3 +的（1）G（4）-> H-3（6）跃迁，在477和490 nm附近观察到了Lu2O3：Yb3 +，Tm3 +纳米晶体的亮蓝色发射。 。观察到540和565 nm附近出现Lu2O3：Er3 +纳米晶体的亮绿色UC发射，并将其分配给H-2（11/2）-> I-4（15/2）和S-4（3/2）- > Er3 +的I-4（15/2）跃迁。随着Lu2O3：Er3 +纳米晶体中Yb3 +浓度的增加，绿色发光强度与红色发光强度的比值减小。在足够的Yb3 +且能替代Er3 +的情况下，由于F-4（9/2）-> I-4（15/2）的跃迁，主要集中在662色调的Lu2O3：Yb3 + / Er3 +发出了鲜红色的UC发射光。的Er3 +。根据不同掺杂的Lu2O3：RE3 +纳米晶体中红色，绿色和蓝色发射的产生，可以通过适当掺杂Yb3 +，Tm3 +和Er3 +来产生包括白色在内的多种颜色的发光。目前的Lu2O3纳米晶体。也就是说，Lu2O3：3％Yb3 + / 0.2％Tm3 + / 0.4％Er3 +纳米晶体显示出合适的蓝，绿和红（RGB）发射强度，从而产生了CIE-x = 0.3456和CIE- y = 0.3179，非常接近标准的等能量白光照明（x = 0.33，y = 0.33）。由于在980 nm激光二极管（LD）激发下，Lu2O3：Yb3 + / Er3 + / Tm3 +纳米晶体中从RGB到白色具有丰富的发光色，它们有可能在彩色显示器，背光，UC激光器，光子学，和生物医学。

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