Preparation, optical property and field-effect mobility investigation of stable white-emissive doped organic crystal

Abstract

The structural, optical and charge-transport properties of a white-emissive doped organic crystal have been investigated.

Molecular doped organic semiconductor crystals for optoelectronic device applications

“…There several requirements regarding the molecular dopants 29,41 for doping in OSSCs: i) The selected host and guest materials need to have similar physical properties, such as solubility or sublimation temperature. For the physical vapor transport (PVT) method, the similar sublimation temperature of the host and guest only requires one heating source in the preparation process.…”

Clarification of the Molecular Doping Mechanism in Organic Single‐Crystalline Semiconductors and their Application in Color‐Tunable Light‐Emitting Devices

“…By taking advantage of this host–guest system, molecular doping technique is employed in organic single‐crystalline semiconductors to combine high mobility and the enhanced light‐emitting properties. It allows to increase the photoluminescence (PL) internal quantum efficiency through suppressing luminescence quenching of the H ‐ aggregate ‐like molecular dipole–dipole interaction . Wang and co‐workers have prepared the tetracene‐ and pentacene‐doped oligo( p ‐phenylenevinylene) crystals which exhibit high luminescent efficiency and color‐tunable emission, and further elucidated their thermodynamics characteristics and charge transport properties .…”

“…It allows to increase the photoluminescence (PL) internal quantum efficiency through suppressing luminescence quenching of the H ‐ aggregate ‐like molecular dipole–dipole interaction . Wang and co‐workers have prepared the tetracene‐ and pentacene‐doped oligo( p ‐phenylenevinylene) crystals which exhibit high luminescent efficiency and color‐tunable emission, and further elucidated their thermodynamics characteristics and charge transport properties . Nakanotani and co‐workers reported tetracene‐doped oligo( p ‐phenylenevinylene) crystals that displayed improved electroluminescence (EL) quantum efficiency under ambipolar operation in light‐emitting OFETs .…”

“…However, the pace of understanding the doping mechanism of the basic stacking modes between host and guest molecules in organic single‐crystalline semiconductors has lagged far behind the rapid progress in research on their applications . It is generally believed that doping molecules are dispersed throughout the host crystal lattice by strong molecular interactions during crystal growth, and that their potential to replace the original host molecules in the crystal lattice is high.…”

“…It is generally believed that doping molecules are dispersed throughout the host crystal lattice by strong molecular interactions during crystal growth, and that their potential to replace the original host molecules in the crystal lattice is high. Moreover, the size of selected guest molecules is similar to that of the host molecules, and they are predicted to fill in defects or vacancies in the crystal lattice without distortion . However, unambiguous evidence of this doping mechanism of the stacking modes between host and guest molecules is lacking due to the difficulty in investigating organic small molecules at the nanoscale.…”