Related Experiment Video
Updated: Jul 20, 2026
07:03
Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
Published on: November 15, 2016
[The influence of frequency on solid state cathodoluminescence].
De-ang Liu1, Zheng Xu, Feng Teng
1Key Laboratory of Luminescence and Optical Information, Institute of Optoelectronic Technology, Beijing Jiaotong University, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 12, 2006
Summary
Solid state cathodoluminescence (SSCL) in organic-inorganic systems was achieved using alternating-current voltage. Different peak intensities at 410 nm and 580 nm correlate with varying emission lifetimes.
Area of Science:
- Organic-inorganic hybrid materials
- Solid-state physics
- Photoluminescence mechanisms
Context:
- Investigating novel light emission mechanisms in organic-inorganic systems.
- Exploring solid-state cathodoluminescence (SSCL) under alternating-current (AC) voltage.
- Utilizing a device structure of ITO/SiO2/MEH-PPV/SiO2/Al for SSCL.
Purpose:
- To achieve and characterize SSCL in a specific organic-inorganic device structure.
- To analyze the spectral properties and temporal behaviors of SSCL emissions.
- To determine the emission lifetimes of different spectral peaks using frequency domain analysis.
Summary:
- Solid-state cathodoluminescence (SSCL) was successfully induced in an ITO/SiO2/MEH-PPV/SiO2/Al device under sinusoidal AC voltage.
- Two emission peaks were observed at 410 nm (molecular theory) and 580 nm (band model).
- Frequency-dependent intensity variations revealed distinct lifetimes: <5 ms for the 410 nm peak and >0.05 ms for the 580 nm peak.
Impact:
- Provides a new method for estimating emission lifetimes in the frequency domain.
- Demonstrates the potential of organic-inorganic systems for AC-driven light emission.
- Offers insights into the fundamental mechanisms governing dual-wavelength emission in SSCL devices.
Related Concept Videos
01:26Variables Affecting Phosphorescence and Fluorescence
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
01:23Photoluminescence: Fluorescence and Phosphorescence
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
01:14Photoluminescence: Applications
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
02:26Photoelectric Effect
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
01:13Atomic Absorption Spectroscopy: Radiation and Light Sources
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
02:58Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...