Nanosecond photoluminescence decay in Mo-doped ZnO nanorods observed by TCSPC and phase shift methods

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00599694" target="_blank" >RIV/68378271:_____/24:00599694 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/24:00377551

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Nanosecond photoluminescence decay in Mo-doped ZnO nanorods observed by TCSPC and phase shift methods

Popis výsledku v původním jazyce

Hydrothermally grown, pellet-pressed Mo-doped zinc oxide (ZnO) nanocrystals were investigated for time-resolved photoluminescence at room temperature under UV excitation. Two optical setups were compared. The TCSPC setup was based on ns-short-pulse excitation followed by time resolved histogram-like counting of emitted photons. The phase-shift method was based on the frequency-resolved phase delay between sinusoidal excitation and emission. Whereas the TCSPC method is nowadays a commercially available and widely used, the second method was built as a low-cost student’s setup with a conventional UV LED as the excitation source, sine-wave voltage generator, an old dispersive monochromator, optical band-pass and long-pass filters, a red-enhanced photomultiplier and a lock-in amplifier. Recently, the setup was upgraded by a new HF2LI Zurich Instruments 50 MHz lock-in amplifier, which also includes pulse generator and a current amplifier to measure the PMT photocurrent. Both methods gave a similar time resolution slightly below 1 ns. While the time resolution of the TCSPC was limited by the excitation pulse width, the time resolution of the phase shift method was limited by the maximum operating frequency of the UV LED (several MHz). To be able to measure the PL decay in ps range, we need to replace UV LED by a new, faster UV excitation source to increase the excitation frequency up to the 50 MHz limit of our lock-in amplifier.

Název v anglickém jazyce

Nanosecond photoluminescence decay in Mo-doped ZnO nanorods observed by TCSPC and phase shift methods

Popis výsledku anglicky

Hydrothermally grown, pellet-pressed Mo-doped zinc oxide (ZnO) nanocrystals were investigated for time-resolved photoluminescence at room temperature under UV excitation. Two optical setups were compared. The TCSPC setup was based on ns-short-pulse excitation followed by time resolved histogram-like counting of emitted photons. The phase-shift method was based on the frequency-resolved phase delay between sinusoidal excitation and emission. Whereas the TCSPC method is nowadays a commercially available and widely used, the second method was built as a low-cost student’s setup with a conventional UV LED as the excitation source, sine-wave voltage generator, an old dispersive monochromator, optical band-pass and long-pass filters, a red-enhanced photomultiplier and a lock-in amplifier. Recently, the setup was upgraded by a new HF2LI Zurich Instruments 50 MHz lock-in amplifier, which also includes pulse generator and a current amplifier to measure the PMT photocurrent. Both methods gave a similar time resolution slightly below 1 ns. While the time resolution of the TCSPC was limited by the excitation pulse width, the time resolution of the phase shift method was limited by the maximum operating frequency of the UV LED (several MHz). To be able to measure the PL decay in ps range, we need to replace UV LED by a new, faster UV excitation source to increase the excitation frequency up to the 50 MHz limit of our lock-in amplifier.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů