TY - JOUR
T1 - The analysis of amplified spontaneous emission and luminescence enhancement of BUBD-1 based on host-guest system
AU - Liu, Tingting
AU - Du, Hui
AU - Li, Shuhong
AU - Wang, Wenjun
AU - Liu, Yunlong
AU - Cui, Dongyue
AU - Wang, Qingru
AU - Zhang, Dong
AU - Zhao, Ling
AU - Dong, Xiaochen
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/5
Y1 - 2021/5
N2 - The lowest amplified spontaneous emission (ASE) threshold (1.51 μJ/pulse) of CBP: 2 wt%BUBD-1 blend films was about 6 times lower than that of BUBD-1 neat film (9.25 μJ/pulse). The OLEDs with blend film as the emission layer (EML) exhibited an excellent photoelectric performance. In this regard, a series of theoretical analysis were carried out to explain the enhancement of ASE and luminescence performance of BUBD-1 in different aspects. Except for the reducing concentration quenching, a higher Stokes shift, energy transfer efficiency and radiation attenuation rate (kr) happened in the blend films. Moreover, the molecular dipole orientation of EML films at the interface and in thin films were analyzed based on the second-harmonic generation (SHG) method and angle-dependent PL spectra analysis. We find that not only the molecular dipole orientation angle alters in the blend film relative to the neat film, but also the angle is different when the films deposited with different methods. Based on the calculated molecular dipole orientation angle, we propose that the varied dipole angle in the blend film contributed to the device properties too. Our works provide a theory insight into the enhancement of ASE and luminescence properties based on host-guest system.
AB - The lowest amplified spontaneous emission (ASE) threshold (1.51 μJ/pulse) of CBP: 2 wt%BUBD-1 blend films was about 6 times lower than that of BUBD-1 neat film (9.25 μJ/pulse). The OLEDs with blend film as the emission layer (EML) exhibited an excellent photoelectric performance. In this regard, a series of theoretical analysis were carried out to explain the enhancement of ASE and luminescence performance of BUBD-1 in different aspects. Except for the reducing concentration quenching, a higher Stokes shift, energy transfer efficiency and radiation attenuation rate (kr) happened in the blend films. Moreover, the molecular dipole orientation of EML films at the interface and in thin films were analyzed based on the second-harmonic generation (SHG) method and angle-dependent PL spectra analysis. We find that not only the molecular dipole orientation angle alters in the blend film relative to the neat film, but also the angle is different when the films deposited with different methods. Based on the calculated molecular dipole orientation angle, we propose that the varied dipole angle in the blend film contributed to the device properties too. Our works provide a theory insight into the enhancement of ASE and luminescence properties based on host-guest system.
KW - Amplified spontaneous emission
KW - Host-guest system
KW - Molecular dipole orientation
KW - Second harmonic generation
UR - http://www.scopus.com/inward/record.url?scp=85098688057&partnerID=8YFLogxK
U2 - 10.1016/j.optlastec.2020.106822
DO - 10.1016/j.optlastec.2020.106822
M3 - 文章
AN - SCOPUS:85098688057
SN - 0030-3992
VL - 137
JO - Optics and Laser Technology
JF - Optics and Laser Technology
M1 - 106822
ER -