Sains Malaysiana 48(6)(2019): 1281–1288

http://dx.doi.org/10.17576/jsm-2019-4806-16

Temperature and Power Dependence of Photoluminescence in PbS Quantum Dots Nanoparticles

(Kesandaran Suhu dan Kuasa Pengujaan terhadap Fotoluminesens Titik Kuantum PbS Berzarah Nano)

MUHAMMAD SAFWAN ZAINI¹, MAZLIANA AHMAD KAMARUDIN¹*, JOSEPHINE LIEW YING CHYI¹, SHAHRUL AINLIAH ALANG AHMAD² & ABDUL RAHMAN MOHMAD³

¹Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

²Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

³Institute of Microengineering and Nanoelectronics, Level 4, Research Complex, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Received: 2 January 2019/Accepted: 28 February 2019

ABSTRACT

In this study, the synthesis and the effect of temperature and power excitation towards photoluminescence (PL) emission of colloidal PbS quantum dots (QDs) were reported. Water soluble PbS QDs capped with a mixture of 1-thioglycerol (TGL) and dithioglycerol (DTG) was synthesized via colloidal chemistry method at room temperature. The PL emission of PbS QDs was investigated under temperature range from 10 K to 300 K and we found that the PL emission blue-shifted when the temperature is increased. From high resolution transmission electron microscopy (HRTEM), the average size of PbS core QDs is determined to be 6 nm and the integrated PL intensity (IPL) versus excitation power density shows the recombination of electrons and holes occur efficiently at low and high temperature for the PbS QDs. Full width half maximum (FWHM) shows a gradual broadening with the increasing temperature due to the interaction of charge carriers with phonons.

Keywords: Near infrared; PbS; photoluminescence; quantum dots

ABSTRAK

Dalam kajian ini, sintesis dan kesan terhadap suhu dan kuasa pengujaan fotoluminesens (PL) ke atas koloid PbS titik kuantum (QDs) dilaporkan. PbS QDs larut air ditutup dengan campuran ligan 1-tiogliserol (TGL) dan ditiogliserol (DTG) telah disintesis melalui kaedah koloid kimia pada suhu bilik. Pancaran PL daripada PbS QDs telah diuji pada julat suhu 10 K sehingga 300 K dan kami mendapati bahawa pancaran PL telah terjadi anjakan biru dengan peningkatan suhu. Daripada mikroskop elektron transmisi tinggi (HRTEM), purata saiz PbS QDs ialah sekitar 6 nm dan daripada data keamatan PL bersepadu (IPL) berlawanan ketumpatan kuasa pengujaan telah menunjukkan penggabungan semula eksiton berlaku secara cekap di dalam suhu rendah dan tinggi untuk PbS QDs. Lebar separuh ketinggian maksimum (FWHM) menunjukkan pelebaran beransur bersama peningkatan suhu disebabkan interaksi daripada pembawa cas dan juga fonon.

Kata kunci: Fotoluminesens; inframerah dekat; PbS; titik kuantum

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*Corresponding author; email: mazliana_ak@upm.edu.my