Qhov sib txawv tseem ceeb ntawm cathodoluminescence thiab photoluminescence yog tias cathodoluminescence cuam tshuam cov emission ntawm lub teeb tau los ntawm electron excitation, whereas photoluminescence cuam tshuam lub emission ntawm lub teeb tau los ntawm optical excitation.
Luminescence yog qhov tshwm sim uas cuam tshuam nrog kev nqus ntawm lub teeb ntawm ib lub wavelength tshwj xeeb ntawm cov tshuaj molecule thiab emission ntawm lub teeb ntawm lub wavelength ntev. Cov no yog hu ua excitation wavelength thiab emission wavelength, feem.
Cathodoluminescence yog dab tsi?
Cathodoluminescence yog qhov tshwm sim ntawm electromagnetic thiab optical phenomenon uas cov electrons cuam tshuam cov khoom siv luminescent ua rau emission ntawm photons, uas tej zaum yuav muaj wavelengths nyob rau hauv lub spectrum pom. Ib qho khoom siv luminescent feem ntau yog phosphor. Thaum peb xav txog qee qhov kev siv lub neej tiag tiag, tiam ntawm lub teeb los ntawm lub teeb hluav taws xob uas tau luam theej duab phosphor-coated sab hauv ntawm lub vijtsam ntawm lub TV uas siv lub raj xa hluav taws xob cathode yog ib qho piv txwv ntawm athodoluminescence. Qhov no optical phenomenon yog inverse ntawm cov nyhuv photoelectric, qhov twg electron emission yog induced los ntawm irradiation nrog photons.
Cathodoluminescence muaj ntau daim ntawv thov hauv microscopy, xws li hauv geology, mineralogy, cov ntaub ntawv tshawb fawb, thiab semiconductor engineering. Nyob rau hauv cov teb no, ib tug scanning electron microscope yog haum nrog ib tug cathodoluminescence detector. Qee lub sij hawm ib qho optical cathodoluminescence microscope yog qhov tseem ceeb hauv kev tshuaj xyuas cov txheej txheem sab hauv ntawm semiconductors, pob zeb, ceramics, iav, thiab lwm yam.
Photoluminescence yog dab tsi?
Photoluminescence yog ib daim ntawv ntawm luminescence uas tshwm sim nrog photoexcitation ntawm photon absorption. Lub teeb emission no tshwm sim thaum ib yam khoom absorbs electromagnetic radiation thiab re-emits cov hluav taws xob. Cov txheej txheem no pib nrog photoexcitation. Qhov no txhais tau hais tias cov electrons ntawm cov khoom raug excitations thaum cov khoom absorbs photons, thiab electrons txav mus rau siab zog xeev los ntawm qis zog xeev. Tom qab cov excitations, muaj cov txheej txheem so thiab. Nyob rau hauv cov kauj ruam so, photons yog re-radiated los yog emissions. Lub sij hawm nruab nrab ntawm qhov nqus thiab emission ntawm photons yuav txawv nyob ntawm seb cov khoom.
Muaj ntau hom photoluminescence uas txawv ntawm ib leeg raws li ob peb yam. Thaum xav txog lub wavelength ntawm absorbed thiab emission wavelengths ntawm photons, muaj ob hom loj li fluorescence thiab resonance fluorescence. Nyob rau hauv fluorescence, lub wavelength ntawm emitted tawg yog qis dua lub wavelength ntawm absorbed wavelength. Nyob rau hauv resonance fluorescence, lub absorbed thiab emission hluav taws xob muaj sib npaug wavelengths.
Qhov txawv ntawm Cathodoluminescence thiab Photoluminescence yog dab tsi?
Luminescence yog qhov tshwm sim kho qhov muag. Nws tuaj yeem pom nyob rau hauv ntau hom, thiab cathodoluminescence thiab photoluminescence yog ob hom. Cathodoluminescence yog ib qho electromagnetic thiab optical phenomenon uas electrons cuam tshuam cov khoom siv luminescent ua rau emission ntawm photons, uas tej zaum yuav muaj wavelengths nyob rau hauv lub pom spectrum. Photoluminescence, ntawm qhov tod tes, yog ib daim ntawv ntawm luminescence uas tshwm sim nrog photoexcitation ntawm photon absorption. Qhov sib txawv tseem ceeb ntawm cathodoluminescence thiab photoluminescence yog tias cathodoluminescence cuam tshuam cov emission ntawm lub teeb tau los ntawm electron excitation, whereas photoluminescence cuam tshuam lub emission ntawm lub teeb tau los ntawm optical excitation.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm cathodoluminescence thiab photoluminescence nyob rau hauv daim ntawv tabular rau kev sib piv ntawm ib sab.
Summary – Cathodoluminescence vs Photoluminescence
Cathodoluminescence yog qhov tshwm sim ntawm electromagnetic thiab optical phenomenon uas cov electrons cuam tshuam cov khoom siv luminescent ua rau emission ntawm photons, uas tej zaum yuav muaj wavelengths nyob rau hauv lub spectrum pom. Photoluminescence yog ib daim ntawv ntawm luminescence uas tshwm sim nrog photoexcitation ntawm photon absorption. Qhov sib txawv tseem ceeb ntawm cathodoluminescence thiab photoluminescence yog tias cathodoluminescence cuam tshuam cov emission ntawm lub teeb tau los ntawm electron excitation, whereas photoluminescence cuam tshuam lub emission ntawm lub teeb tau los ntawm optical excitation.
