Related Experiment Video
Updated: Aug 10, 2025

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Two-photon absorption behavior of conjugated oligomers suitable for low colour temperature LEDs
Tianhao Huang1, Chengzi Jiang2, Tianning Xu1
1Department of Science, Zhijiang College of Zhejiang University of Technology Shaoxing 312030 China hth@zzjc.edu.cn xutianning@zjut.edu.cn.
Abstract:
Light emitting diodes (LEDs) with low colour temperatures (CTs) have been proved to be physiologically-friendly light sources. However, there are few reports on the photophysical properties of luminescent materials with CTs lower than candlelight. Herein, one- and two-photon optical properties of four fluorenone-based conjugated oligomers have been systemically investigated. By using a sum-over-essential states (SOS) approach, we obtained the transition dipole moments and two-photon absorption (TPA) cross sections. The triphenylamine end-capped oligomer exhibits reddish orange luminescence with extremely low colour temperature of 1686 K, which is much lower than that of candlelight. Fluorene-ethylene units serving as π-spacers could weaken the role of electron-donating units and effectively enhance the TPA performance of oligomers. Our results provide an effective way for the design and optimization of universal light-emitting material candidates in optoelectronic devices.
More Related Videos
07:44Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
10:41Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
Published on: May 31, 2018
Related Concept Videos
UV–Vis Spectroscopy of Conjugated Systems
One of the factors influencing λmax is the extent...
Variables Affecting Phosphorescence and Fluorescence
Photoluminescence: Applications
Photoluminescence: Fluorescence and Phosphorescence
A pair of electrons in a...
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation