A Study On Observation Of Photoluminiscene

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A study on observation of photoluminiscene in Ruthenium-based dye (cis-diisothiocyanato-bis(2,2’-bipyridil-4,4’-dicarboxylic acid)ruthenium (II))

Adlina Izny binti Ahmad
Advanced Material Laboratory
Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang
Kuantan, Malaysia

Abstract
Photoluminescence is light emission that form after the absorption of photons. Dye act as a light absorber. Organic dye is one type of dye, have a small band gap and use as semiconducting material. It will excite the excited electron after absorb light as energy from highest occupied molecular orbital(HOMO) to lowest unoccupied molecular orbital(LUMO). The energy of photon must be greater than energy of band gap in order to excite electron.
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Dye always acts as a light absorber. Dye will absorb light to excite the excited electron state from HOMO to LUMO. So absorbed of photons will be happened and dye will fall back from LUMO to HOMO. So emission of photon will be happened. So the wavelength during absorbance and emission process can be identified by using Photoluminescene (PL) spectrometer. By knowing the wavelength we can determine the concentration of dye. Ruthenium dye is one of the organic dye where it contains small band gap, so it only needs small energy to excite the photon from LUMO to HOMO. So if the dye absorb red colour it will reflect blue colour (refer figure 1). Figure 1: a wheel of colour to estimate absorbed light based on colour of dye
Objectives
1. To speculate range of absorbed and reflected wavelength of light by Ruthenium-based dye based on its colour
2. To characterize photoluminescence property of the dye using Photoluminescence(PL) spectrometer; usng radiation source which energy is based on the speculated absorbed wavelength
3. To estimate energy loss via radiative recombination i.e., recombination of electron with hole in the lowest unoccupied molecular orbital (LUMO) of dye.
Materials and instruments
PL spectrometer, gloves, 1000µL micropipette, deionized water, ethanol, 1 PL quarts cuvette, and cis-diisothiocyanato-bis(2,2’-bipyridyl-4,4’-dicarboxylic acid)ruthenium(II) dye (Solaronix) Figure 2:

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