PtT975 Lifetime measurement (라이프타임)

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목차

1. Introduction
2. Experimental Method
3. Result and Discussion
4. Conclusion
5. Reference

 

본문내용일부

Introduction

1. Principle of fluorescence and phosphorescence

Fluorescence and phosphorescence are types of luminescence, which is the spontaneous emission of light. Fluorescence is a radiative process from the lowest excited state (S1) to the ground state (S0) in a fast (10-9 to 10-6s). However, in the phosphorescence, fast intersystem crossing from singlet excited state (S1) to the triplet excited state (T1) occurs and the following relaxation process happens, which is called phosphorescence. In fact, the decay of the T1 state back to the S0 is a forbidden transition since the states have different spin multiplicity, due to conservation of angular momentum. However, spin-orbit coupling relaxes this restriction and a radiative transition from the T1 to the S1 becomes possible. T1 to S0 transition occurs on a much slower timescale, microseconds to thousands of seconds.

2. UV/Vis spectrometer

UV/Vis spectrometer measures the absorption intensity of UV and visible region as 200nm~900nm.

 

참고문헌

Experiment 4: Luminescence Lifetime Measurement Manual, Spring 2021, CH3207, GIST college
Sergey M. Borisov, CHAPTER 1:Fundamentals of Quenched Phosphorescence O2 Sensing and Rational Design of Sensor Materials , in Quenched-phosphorescence Detection of Molecular Oxygen: Applications in Life Sciences, 2018, pp. 1-18 DOI: 10.1039/9781788013451-00001
What is the difference between fluorescence, phosphorescence and luminescence? (2021, April 22). Retrieved from https://www.enzolifesciences.com/science-center/technotes/2019/december/what-is-the-difference-between-fluorescence-phosphorescence-and-luminescence?/
Instruments, S. S. (2019, September 25). UV-Vis Frequently Asked Questions - Instrument Design. Retrieved from https://www.ssi.shimadzu.com/products/uv-vis-spectrophotometers/faqs/instrument-design.html
Instrumentation. Bates College, 10 June 2020, https://chem.libretexts.org/@go/page/111546.

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