Qhov sib txawv tseem ceeb ntawm fluorescence thiab phosphorescence yog tias Fluorescence nres sai li sai tau thaum peb tshem tawm lub teeb pom kev thaum phosphorescence nyiam nyob ntev me ntsis txawm tias tom qab lub teeb pom kev raug tshem tawm.
Thaum lub molecule lossis atom nqus lub zog, nws tuaj yeem hloov pauv ntau yam. Fluorescence thiab phosphorescence yog ob txoj haujlwm zoo li no. Ntxiv rau qhov sib txawv tseem ceeb saum toj no, muaj qee qhov sib txawv ntawm ob nqe lus xws li lub zog tso tawm hauv cov txheej txheem fluorescence siab dua li hauv phosphorescence.
Fluorescence yog dab tsi?
Electrons nyob rau hauv ib lub atom los yog ib tug molecule yuav nqus tau lub zog nyob rau hauv lub electromagnetic hluav taws xob thiab li excite mus rau lub sab sauv zog lub xeev. Lub zog sab sauv no tsis ruaj khov; yog li ntawd, electron nyiam rov qab los rau hauv av. Thaum rov qab los, nws emits lub absorbed wavelength. Nyob rau hauv cov txheej txheem so, lawv emit ntau zog li photons. Peb hu cov txheej txheem so no ua fluorescence. Fluorescence tshwm sim sai dua. Feem ntau, nws ua tiav hauv li 10-5 vib nas this lossis tsawg dua lub sijhawm los ntawm lub sijhawm excitation.
Thaum gaseous atoms undergo fluorescence, atomic fluorescence tshwm sim thaum raug hluav taws xob nrog lub wavelength uas raws nraim ib qho ntawm cov kab nqus ntawm lub caij. Piv txwv li, gaseous sodium atoms nqus thiab excite los ntawm absorbing 589 nm hluav taws xob. Kev so yuav siv sij hawm qhov chaw tom qab qhov no los ntawm remission ntawm fluorescent hluav taws xob ntawm qhov zoo tib yam wavelength. Vim li no, peb tuaj yeem siv fluorescence los txheeb xyuas cov ntsiab lus sib txawv. Thaum excitation thiab remission wavelengths zoo ib yam, peb hu ua qhov tshwm sim emission li resonance fluorescence.
Lwm yam Mechanisms
Lwm yam tshaj li cov fluorescence, muaj lwm yam txheej txheem uas lub atom zoo siab lossis molecule tuaj yeem tso nws lub zog ntau dhau thiab so rau hauv av. Tsis yog-radiative so thiab fluorescence emissions yog ob qho tseem ceeb mechanisms. Vim muaj ntau yam mechanisms, lub neej ntawm lub xeev zoo siab yog luv luv. Cov txheeb ze ntawm cov molecules uas fluoresce yog me me vim tias qhov tshwm sim no yuav tsum muaj cov yam ntxwv uas ua rau qeeb tus nqi ntawm qhov tsis muaj hluav taws xob so thiab txhim kho tus nqi fluorescence. Hauv feem ntau cov molecules, cov yam ntxwv no tsis nyob ntawd; Yog li ntawd, lawv tau txais tsis muaj hluav taws xob so, thiab fluorescence tsis tshwm sim. Molecular fluorescence bands muaj ntau ntawm cov kab sib ze; yog li ntawd, feem ntau nws nyuaj rau daws.
Phosphorescence yog dab tsi?
Thaum molecules nqus lub teeb thiab mus rau lub xeev zoo siab lawv muaj ob txoj kev xaiv. Lawv tuaj yeem tso tawm lub zog thiab rov qab los rau hauv av hauv lub xeev tam sim ntawd lossis dhau mus rau lwm cov txheej txheem tsis muaj hluav taws xob. Yog hais tias lub zog molecule tau dhau los ua cov txheej txheem tsis muaj hluav taws xob, nws tso tawm qee lub zog thiab tuaj rau lub xeev triplet qhov twg lub zog me ntsis qis dua lub zog ntawm lub xeev tawm, tab sis nws siab dua lub zog hauv av. Cov molecules tuaj yeem nyob ntev me ntsis hauv lub xeev qis zog triplet.
Daim duab 01: Phosphorescence
Peb hu lub xeev no ua lub xeev metastable. Tom qab ntawd metastable xeev (triplet xeev) tuaj yeem maj mam lwj los ntawm emitting photons, thiab rov qab los rau hauv av (singlet state). Thaum qhov no tshwm sim peb hu nws phosphorescence.
Qhov txawv ntawm Fluorescence thiab Phosphorescence yog dab tsi?
Fluorescence yog qhov emission ntawm lub teeb los ntawm ib yam khoom uas tau nqus lub teeb lossis lwm yam hluav taws xob hluav taws xob thaum phosphorescence hais txog lub teeb tawm los ntawm cov khoom tsis muaj hluav taws xob lossis hluav taws xob pom. Thaum peb muab lub teeb rau cov qauv ntawm cov molecules, peb tam sim ntawd pom cov fluorescence. Fluorescence nres sai li sai tau thaum peb tshem tawm lub teeb ci. Tab sis phosphorescence nyiam nyob ntev me ntsis txawm tias tom qab peb tshem tawm cov teeb pom kev irradiating.
Summary – Fluorescence vs Phosphorescence
Ob leeg fluorescence thiab phosphorescence yog cov txheej txheem tshuaj uas ua rau lub teeb nqus thiab emission tshwm sim. Qhov sib txawv ntawm fluorescence thiab phosphorescence yog tias Fluorescence nres sai li sai tau thaum peb tshem tawm lub teeb qhov chaw thaum phosphorescence nyiam nyob ntev me ntsis txawm tias tom qab lub teeb pom kev raug tshem tawm.
