Optical amplification and photodegradation in films of spiro-quaterphenyl and its derivatives

Optical amplification and photodegradation in films of spiro-quaterphenyl and its derivatives
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螺四联苯及其衍生物薄膜的光放大和光降解

DOI:
10.1016/j.jlumin.2014.10.065
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发表时间:
2015
影响因子:
3.6
通讯作者:
H. Hillmer
H. Hillmer
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Abdel-Awwad;H. Luan;F. Messow;T. Kusserow;A. Wiske;A. Siebert;T. Fuhrmann-Lieker;J. Salbeck;H. Hillmer

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研究了螺-季苯基及其两个衍生物在平面波导中的荧光光谱和光学常数。确定了放大自发发射阈值和光增益。研究了ASE光谱位置、ASE阈值和光增益与厚度的关系。此外,还比较了螺-季苯基和甲氧基螺-季苯基在空气和真空中的光降解情况。采用真空气相沉积技术制备了不同厚度(30 ~ 220 nm)的薄膜。基于可变条纹长度法的测量装置,利用ASE确定了阈值和光增益。螺-季苯、甲氧基螺-季苯和苯氧基螺-季苯的阈值分别为22±5.7µJ/cm2、51±2.1µJ/cm2和70±10µJ/cm2。在泵浦能量为3000µJ/cm2时,螺-季苯基、甲氧基螺-季苯基和苯氧基螺-季苯基的最大增益分别为107.5±7 cm−1、104±6 cm−1和184±1.2 cm−1。
Fluorescence spectra and optical constants in planar waveguides of spiro-quaterphenyl and two of its derivatives are investigated. Threshold of amplified spontaneous emission (ASE) and optical gain are determined. The thickness dependence of ASE spectral position, ASE threshold, and optical gain are investigated as well. Additionally, photodegradation in air and in vacuum for spiro-quaterphenyl and methoxy-spiro-quaterphenyl is compared. Films with various thicknesses (30–220 nm) have been deposited by vacuum vapor deposition. A measurement setup based on the variable stripe length method was used to determine the threshold and the optical gain using ASE. A threshold of 22±5.7 µJ/cm2, 51±2.1 µJ/cm2and 70±10 µJ/cm2was measured for spiro-quaterphenyl, methoxy-spiro-quaterphenyl and phenoxy-spiro-quaterphenyl respectively. At pump energy fluence of 3000 µJ/cm2, maximum gain of 107.5±7 cm−1, 104±6 cm−1and 184±1.2 cm−1was achieved for spiro-quaterphenyl, methoxy-spiro-quaterphenyl and phenoxy-spiro-quaterphenyl respectively.
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