Abstract Rhodamine B hydrazine was designed as a novel dual-channel ion probe detecting to nitrite among anions and mercury ion among cations, which shows downshifting (DS, the normal PL process) and upconversion (UC, the emission of short-wavelength excited by long-wavelength light) fluorescence enhancement responding. This probe in UC channel has ten times wider ions detection range than in DS channel, while the probe in DS channel has a higher sensitivity than in UC channel. These results demonstrated that different detection ranges and sensitivities could be qualitatively and quantitatively detected. And different level detection ranges and sensitivity can be simultaneously realized by one fluorescent probe through two luminescent channels. Therefore one fluorescent probe can own both wide detection range and high sensitivity simultaneously. Therefore, a flexible detection strategy achieving the win-win situation in one probe has been demonstrated to meet the ion detection's demand in real environmental analysis, that is, DS channel can be used when accurate detection results were needed while UC channel was applied when wide detection range of ions were required.

中文翻译：

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基于升频/降档的双通道 NO2−/Hg2+ 检测

摘要 罗丹明 B 肼被设计为一种新型双通道离子探针，用于检测阴离子中的亚硝酸盐和阳离子中的汞离子，表现出下移（DS，正常 PL 过程）和上转换（UC，长波激发的短波发射）。 -波长光）荧光增强响应。UC通道中的这种探针的离子检测范围是DS通道中的十倍，而DS通道中的探针比UC通道中的探针具有更高的灵敏度。这些结果表明可以定性和定量检测不同的检测范围和灵敏度。一个荧光探针通过两个发光通道可以同时实现不同水平的检测范围和灵敏度。因此一种荧光探针可以同时具有宽检测范围和高灵敏度。