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 ASBAHI^2,3, 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

Received: 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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*Corresponding author; email: hafizhj@ukm.edu.my