PHOTOPHYSICAL PROPERTIES AND PHOTOISOMERIZATION PROCESSES OF METHYL-RED EMBEDDED IN RIGID POLYMER

被引：60

作者：

LEE, GJ ^{[1
]}

KIM, DH ^{[1
]}

LEE, MY ^{[1
]}

机构：

[1] EWHA WOMANS UNIV,DEPT CHEM,SEOUL 120750,SOUTH KOREA

来源：

APPLIED OPTICS | 1995年 / 34卷 / 01期

关键词：

METHYL RED; PMMA; ISOMERIZATION; ISOSBESTIC POINT; S-1; LIFETIME; T-1;

D O I：

10.1364/AO.34.000138

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The photophysical properties of Methyl Red molecules embedded in a poly(methyl methacrylate) (PMMA) matrix were investigated with photoinduced absorption, absorption kinetics, steady-state, and time-resolved luminescence spectroscopy. The excited singlet (S-1) state lifetimes for trans and cis isomers of Methyl Red in PMMA at room temperature have been measured as 35 and 420 ps, respectively. The excited triplet (T-1) state energy level and its lifetime at 77 K were also obtained. A slow trans-cis isomerization process having a time constant of a few hundred seconds was observed for the illuminated Methyl Red in rigid polymer. Based on measured photophysical properties and dynamic processes, an energy-level diagram for Methyl Red molecules in rigid polymer is introduced to explain these observations.

引用

页码：138 / 143

页数：6

共 23 条

[1]

ATKINS PW, 1978, PHYSICAL CHEM, P172

[2] HIGH-PRESSURE STUDY OF THE EFFECT OF VISCOSITY ON FLUORESCENCE AND PHOTOISOMERIZATION OF TRANS-STILBENE [J].