Abstract We studied absorption and fluorescence as well as room temperature phosphorescence (RTP) of 4-methylumbelliferone (4MU) in poly (vinyl alcohol) (PVA) films. We focused our study on the long-wavelength basic form of 4MU with absorption centered at 375 nm. The strong fluorescence with a quantum yield of above 70% appears at ~ 430 nm. The fluorescence anisotropy of 4MU-doped PVA film is high, reaching a value of about 0.3. The emission with gated detection shows a broad phosphorescence spectrum with a peak at ~ 510 nm and a residual delayed fluorescence at 430 nm. The excitation spectra for fluorescence and phosphorescence roughly follows 4MU absorption. The phosphorescence lifetime of 4MU is remarkably long, almost 3 s. 4MU excitation and emission phosphorescence anisotropies are low, very close to zero.

Bong Lee

Emma Alexander

Danh Pham

Mariusz Gagoś

Arkadiusz Matwijczuk

Zygmunt Gryczynski

Ignacy Gryczynski

Methods and Applications in Fluorescence

荧光方法和应用侧重于荧光光谱、成像、显微镜、荧光探针、标记和（纳米）材料的新发展。它将以方法和高级（生物）应用为特色，并接受原始研究文章、评论和技术说明。

The journal "Methods and Applications in Fluorescence" focuses on new developments in fluorescence spectroscopy, imaging, microscopy, fluorescent probes, labeling, and (nano) materials. It will feature methods and advanced (bio) applications, and will accept original research articles, reviews, and technical notes.

《Methods and Applications in Fluorescence》期刊专注于荧光光谱、成像、显微镜、荧光探针、标记和（纳米）材料等领域的新发展。期刊将重点介绍方法和高级（生物）应用，并接受原创研究文章、评论和技术说明。

Category	Quartile
化学	3
化学, 分析化学	4
化学, 物理化学	4

Spectral properties of 4-methylumbelliferone in PVA films; long-lived room temperature phosphorescence

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Journal Info

Category	Quartile
CHEMISTRY, PHYSICAL	3