講演情報
[10a-B32-3]Impact of Host Materials on Amplified Spontaneous Emission of Vacuum-Deposited Host-Guest Organic Thin Films
〇(P)Maziar Jafari1,2, Yusei Kaya2,3, Takuma Saeki2,3, Youhei Chitose2,3, Shota Fukuma2,3, Chihaya Adachi2,3,4 (1.JSPS Fellow, 2.OPERA, Kyushu Univ., 3.Eng. Kyushu Univ., 4.I2CNER, Kyushu Univ.)
キーワード：
Amplified Spontaneous Emission (ASE)、Operational Photostability、Host Effects on Guest Emission Mechanisms
Host-guest architectures in organic semiconductor thin films are essential for facilitating the efficient resonant energy transfer required to achieve population inversion in organic semiconductor lasers. Here we compare the Amplified Spontaneous Emission (ASE) thresholds and operational photostability of vacuum-deposited films of 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) and its structural isomer 3,3'-bis(N-carbazolyl)-1,1'-biphenyl (mCBP) doped at 6, 13, and 20 wt% with newly synthesized benzodifuran derivatives. While mCBP-doped films maintained comparable photoluminescence quantum yields (ΦPLQY = 62-74% vs. 46-83%) and photoluminescence lifetimes (kr = 0.34-0.39 vs. 0.23-0.40 ns-1) alongside an expected enhancement in film morphological stability, their ASE thresholds evolved oppositely as a function of dopant concentration. Furthermore, mCBP host systems exhibited a photostability T50 up to ~4× longer. These differing results are explained by host-driven quenching pathways linked to photophysical properties and molecular organizations.