Qhov sib txawv tseem ceeb ntawm photoluminescence thiab fluorescence yog tias photoluminescence tshwm sim los ntawm absorbing thiab emitting photons muaj qhov sib txawv los yog sib npaug wavelengths whereas fluorescence tshwm sim ntawm emitting ib tug ntev wavelength tshaj lub absorbed wavelength.
Luminescence yog txheej txheem ntawm lub teeb emission. Peb siv lub prefix yees duab- nrog lub sij hawm luminescence thaum lub teeb emission yog vim nqus thiab emission ntawm photons. Qee zaum cov photons absorbed thiab emissions muaj tib lub wavelength. Txawm li cas los xij, qee zaum, lub wavelength absorbed yog siab tshaj qhov emission wavelength. Peb hu hom luminescence li fluorescence. Yog li ntawd, fluorescence yog ib daim ntawv ntawm photoluminescence.
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 pib nrog photoexcitation. Qhov no txhais tau hais tias cov khoom siv hluav taws xob tau txais kev zoo siab thaum cov khoom nqus photons thiab electrons txav mus rau lub zog siab dua los ntawm lub xeev qis zog. 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.
Daim duab 01: Schematic rau Excitation-Relaxation Processes ntawm Photoluminescence
Muaj ntau hom photoluminescence uas txawv ntawm ib leeg raws li ob peb yam. Thaum xav txog lub wavelength ntawm absorbed thiab emitted wavelengths ntawm photons, muaj ob hom loj fluorescence thiab resonance fluorescence. Fluorescence piav qhia tias lub wavelength ntawm emitted tawg yog qis dua lub wavelength ntawm absorbed wavelength. Resonance fluorescence piav qhia tias cov hluav taws xob absorbed thiab emissions muaj qhov sib npaug wavelengths.
Fluorescence yog dab tsi?
Fluorescence yog ib daim ntawv ntawm photoluminescence nyob rau hauv uas ib yam khoom emits lub teeb nrog ib tug sib txawv wavelength rau cov absorbed wavelength. Feem ntau, lub teeb emitted muaj lub wavelength ntev dua li ntawm lub nqus nqus wavelength. Yog li ntawd lub zog ntawm lub teeb emitted yog qis dua lub teeb absorbed.
Daim duab 02: Fluorescence ntawm cov khoom sib txawv hauv qab UV teeb-zoo li zaj sawv
Feem ntau, cov khoom nqus hluav taws xob nyob rau hauv UV ntau yam, emitting lub teeb nyob rau hauv cheeb tsam pom; Yog li, peb tuaj yeem pom cov xim ci ntsa iab ntawm cov khoom no. Peb tuaj yeem pom cov xim no tsuas yog thaum peb nthuav tawm cov khoom rau UV teeb. Txawm li cas los xij, cov hluav taws xob emissions nres sai tom qab peb tshem cov khoom tawm ntawm UV teeb. Muaj ntau qhov chaw uas peb siv cov txheej txheem fluorescence, piv txwv li mineralogy, gemology, tshuaj, thiab lwm yam.
Qhov txawv ntawm Photoluminescence thiab Fluorescence yog dab tsi?
Photoluminescence yog ib daim ntawv ntawm luminescence uas tshwm sim nrog photoexcitation ntawm photon absorption. Fluorescence yog ib daim ntawv ntawm photoluminescence nyob rau hauv uas ib yam khoom emits lub teeb nrog ib tug sib txawv wavelength rau cov absorbed wavelength. Txawm hais tias fluorescence yog ib daim ntawv ntawm photoluminescence, photoluminescence tuaj yeem xa mus rau fluorescence lossis resonance fluorescence, uas txawv ntawm ib leeg nyob ntawm qhov wavelengths ntawm absorbed thiab emitted tawg. Raws li qhov no, qhov sib txawv ntawm photoluminescence thiab fluorescence yog tias nyob rau hauv photoluminescence, lub wavelengths ntawm absorbed thiab emitted photons yuav zoo ib yam los yog txawv. Tab sis, nyob rau hauv resonance fluorescence, lub wavelength ntawm lub absorbed photons yog siab tshaj lub emitted photons.
Summary – Photoluminescence vs Fluorescence
Ob qho tib si photoluminescence thiab fluorescence yog cov ntaub ntawv ntawm luminescence; lub teeb emission. Qhov sib txawv tseem ceeb ntawm photoluminescence thiab fluorescence yog tias photoluminescence tshwm sim los ntawm absorbing thiab emitting photons muaj qhov sib txawv los yog sib npaug wavelengths whereas fluorescence tshwm sim ntawm emitting ib tug ntev wavelength tshaj lub absorbed wavelength.
