Sains Malaysiana 49(11)(2020): 2801-2809

http://dx.doi.org/10.17576/jsm-2020-4911-19

 

Photophysical Properties and Energy Transfer Mechanism in PFO/TiO2/MEH-PPV Nanocomposite Thin Films 

(Sifat Fotofizikal dan Mekanisma Pemindahan Tenaga dalam Filem Nipis Nano Komposit PFO/TiO2/MEH-PPV)
 

SAMEER ALBATI1, MOHAMMAD HAFIZUDDIN HJ. JUMALI1*, BANDAR ALI AL ASBAHI2,3, SAIF M.H. QAID2 & CHI CHIN YAP1

 

1School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

2Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia

 

3Department of Physics, Faculty of Science, Sana'a University, Yemen

 

Diserahkan: 16 December 2019/Accepted: 22 May 2020

 

ABSTRACT

Improvement in photophysical properties of poly-9,9-dioctylfluorene (PFO)/10 wt. % TiO2 nanoparticle thin film as a result of systematic additions of poly(2-methoxy-5(2-ethylhexyl)-1,4-phenylenevinylene (MEH-PPV) were investigated. The nanocomposite blends were prepared with additions of MEH-PPV up to 3.0 wt. % of the total weight. All blends were prepared using the solution blending method and subsequently spin-coated onto glass substrates. The UV-Vis absorption and photoluminescence characterizations showed the intensification of the primary-color emissions of the thin films with the Förster resonance as the primary energy transfer mechanism from PFO to MEH-PPV. Important photophysical parameters, such as the Förster radius  excited state lifetime ( ), fluorescence quantum yield of the donor (φ), quenching constant ( ), quenching rate constant ( ), distance between the donor and acceptor ( ), energy transfer lifetime ( , and energy transfer rate (  display better values with increasing the contents of MEH-PPV by 2.5 wt. %, suggesting an ordered improvement on the photophysical properties of the thin film. Finally, a possible underlying mechanism describing the enhancement of the photophysical properties was proposed.

 

Keywords: Donor/acceptor; energy transfer properties; Förster resonance energy transfer; optical properties

 

ABSTRAK

Peningkatan sifat fotofizikal filem nipis adunan poli-9, 9-dioktilflorin (PFO)/10 bt % nanozarah TiO2 dengan penambahan secara sistematik poli(2-metoksi-5(2-etilheksil)-1, 4-fenileenevinilene (MEH-PPV) adalah dibuktikan. Adunan nanokomposit ini disediakan dengan menambah MEH-PPV sehingga 3.0 bt % daripada berat keseluruhan. Kesemua adunan disediakan menggunakan teknik adunan larutan dan kemudiannya dimendapkan ke atas substrat kaca menggunakan teknik salutan berputar. Pencirian penyerapan UV-Vis dan fotoluminesens menunjukkan peningkatan keamatan pancaran filem nipis dengan pemindahan tenaga resonans Förster sebagai mekanisma pemindahan tenaga primer daripada PFO kepada MEH-PPV. Semua parameter fotofizikal yang penting seperti jejari Förster , jangka hayat keadaan teruja( ), hasilan kuantum pendarfluor oleh penderma (φ), pemalar pelindapkejutan ( ), pemalar kadar pelindapkejutan ( ), jarak antara penderma dan penerima (), jangka hayat pemindahan tenaga (  dan kadar pemindahan tenaga (  menunjukkan nilai yang lebih baik dengan penambahan MEH-PPV sekaligus membuktikan penambahbaikan yang teratur terhadap sifat fotofizikal filem nipis. Dengan kehadiran nanozarah, keamatan sinaran warna prmier telah meningkat dengan pancaran yang seimbang antara PFO dan MEH_PPV Berjaya dicapai pada kandungan MEH-PPV sebanyak 2.5 bt % mencadangkan peningkatan yang teratur pada sifat fotozikal filem nipis. Kesimpulannya, mekasnima yang sesuai untuk menerangkan peningkatan sifat fotofizikal turut dicadangkan.

 

Kata kunci: Pemindahan tenaga resonan Förster; penderma/penerima; sifat optik; sifat pemindahan tenaga

 

 

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*Pengarang untuk surat-menyurat; email: hafizhj@ukm.edu.my

   

 
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