Micro-Raman and Cathodoluminescence Microscopy and ......Applications of Cathodoluminescence • Light emitting diodes – Gives emission spectra as a function of position on the micron

Micro-RamanandCathodoluminescence

MicroscopyandSpectroscopy

Zhiheng LiuandMattDeLongDepartment ofPhysicsandAstronomy,UniversityofUtah

Micro-RamanandPhotoluminescenceSpectroscopyandMicroscopy

• WiTecAlphaSNOMsystem• Sub-micronspatialresolution• 2D-scancapabilityforspectral

imaging• Multiplelaserlinesfor

excitation

Micro-RamanofGraphene

Sisubstrate

Laser line

Gband

2Dband

Spectralimageofnanowire

Cathodoluminescence inSEM

ApplicationsofCathodoluminescence

• Lightemittingdiodes– Givesemissionspectraasafunctionofpositiononthemicronscale

• Geology– Analysisofzircons,quartzandother luminescentmaterialsonthe

deepsubmicronscale– Infergeologicalhistory

• LuminescenceimagingwithnanoscalespatialresolutionprovidedbySEM.

• Illuminatesstructuresnotvisibleinsecondaryelectronimages.

• Givesdetailedinformationoncomposition(viaspectraandemissionintensities)notpossiblebyothertechniques.

SecondaryElectronImageofZircon

All-LightCLImageofZircon

ZirconEmissionSpectrumfrom300to1000nm