1 引言
2 结果与讨论
2.1 CsPbBr3@BPA量子点的合成
图2 利用不同配体合成CsPbBr3量子点的发射光谱(A), 不同OLA添加量合成CsPbBr3量子点的发射光谱(B)和归一化荧光强度(D), 不同BPA添加量合成CsPbBr3量子点的发射光谱(C)和归一化荧光强度(E)Figure 2 Emission spectra of CsPbBr3 QDs synthesized with different ligands (A), emission spectra (B) and normalized photoluminescence intensity (D) of CsPbBr3 QDs synthesized with different OLA addition amounts, and emission spectra (C) and normalized photoluminescence intensity (E) of CsPbBr3 QDs synthesized with different BPA addition amounts |
2.2 CsPbBr3@BPA量子点的表征
图3 CsPbBr3@BPA量子点的紫外可见吸收光谱和发射光谱(A, 内插图为对应的溶液光学照片), CsPbBr3@BPA量子点的透射电镜图片(B, 内插图为高分辨透射图片), CsPbBr3@BPA量子点的粒径分布(C), X-射线粉末衍射(D)及傅里叶变换红外光谱(E), Cs (F)、Pb (G)和Br (H)的高分辨X射线电子能谱图Figure 3 The UV-Visible absorption and emission spectra of CsPbBr3@BPA QDs (A, the inset shows the corresponding optical photograph of the solution), the TEM and high-resolution image (inset) of CsPbBr3@BPA QDs (B), the size distribution (C), XRD pattern (D), FTIR spectrum (E) of CsPbBr3@BPA QDs, the high-resolution XPS spectra of (F) Cs, (G) Pb, and (H) Br elements of CsPbBr3@BPA QDs |
2.3 基于CsPbBr3@BPA量子点的Cr(VI)检测
图4 添加Cr(VI)前后CsPbBr3@BPA量子点水溶液的发射光谱图(A), 20和30 ℃条件下荧光猝灭的Stern-Volmer图(B), 添加Cr(VI)前后CsPbBr3@BPA量子点溶液的荧光衰减曲线图(C), 添加不同浓度Cr(VI)后CsPbBr3@BPA量子点溶液的发射光谱图(D), Cr(VI)浓度与猝灭率的线性关系图(E), 不同金属离子存在时CsPbBr3@BPA量子点水溶液在365 nm紫外光照射下的照片(F), 含有不同金属离子的CsPbBr3@BPA量子点水溶液在添加Cr(VI)前后的相对荧光强度(G)Figure 4 Emission spectra of CsPbBr3@BPA QDs aqueous solution before and after the addition of Cr(VI) (A). Stern-Volmer plots of fluorescence quenching at 20 and 30 ℃ (B). Fluorescence decay curves of CsPbBr3@BPA QDs solution before and after the addition of Cr(VI) (C). Emission spectra of CsPbBr3@BPA QDs solution after the addition of different concentrations of Cr(VI) (D). Linear relationship between Cr(VI) concentration and quenching efficiency (E). Photographs of CsPbBr3@BPA QDs aqueous solution under 365 nm UV irradiation in the presence of different metal ions (F). Relative fluorescence intensity of CsPbBr3@BPA QDs aqueous solution containing different metal ions before and after the addition of Cr(VI) (G) |
2.4 分析性能
2.5 实际水样中Cr(VI)的测定
2.6 LEDs应用
图5 绿光(A)和白光(B) LEDs的CIE色度坐标, 绿光(C)和白光(D) LEDs对应的发射光谱(内插图: 绿光和白光LEDs发光的光学照片)Figure 5 CIE chromaticity coordinates of green (A) and white (B) LEDs, and the corresponding emission spectra of green (C) and white (D) LEDs (inset: optical photographs of the green and white LEDs in operation) |