Characteristics of CuInS2/ZnS quantum dots and its application on LED

✍ Scribed by Hyunki Kim; Ji Yeon Han; Dong Seok Kang; Sung Wook Kim; Dong Seon Jang; Minwon Suh; Artavazd Kirakosyan; Duk Young Jeon

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 904 KB
• Volume: 326
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2011.01.059

✦ Synopsis

In this research, CuInS 2 quantum dots (QDs) have been studied as an excellent red emitting source for white LED because of its non-toxic deep red emission, and large Stokes shift properties. The CuInS 2 QDs are synthesized by the one-pot method, which is a candidate for the mass-production method. In addition, formation of ZnS shells on QD surfaces has been conducted in order to reduce non-radiative recombination on its surface defects. The photoluminescence (PL) characteristics of core/shell quantum dot show that the maximum PL wavelength blue-shifts by about 80 nm on increasing its intensity more than 6 times. Quantum yield (QY) of the CuInS 2 /ZnS QDs shows about 67% as the maximum value. The dispersion of the quantum dots in polystyrene, which is hydrophobic and transparent, was also conducted using co-dispersing toluene. Finally, the polystyrene/quantum dot composite was applied on blue LEDs and it showed luminous efficacy of 10.7 lm/W and (0.4338, 0.1827) CIE coordinates.