Fractional contributions of defect-originated photoluminescence from CuInS2/ZnS coreshells for hybrid white LEDs

Quinton Rice, Sangram Raut, Rahul Chib, Zygmunt Gryczynski, Ignacy Gryczynski, Wenjin Zhang, Xinhua Zhong, Mahmoud Abdel-Fattah, Bagher Tabibi, Jaetae Seo

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Abstract

The wide optical tunability and broad spectral distribution of CuInS2/ZnS (CIS/ZnS) coreshells are key elements for developing the hybrid white light emitting diodes where the nanoparticles are stacked on the blue LEDs. Two CIS/ZnS555 nm and CIS/ZnS665 nm coreshells are utilized for the hybrid white LED development. The time-resolved spectroscopy of CIS/ZnS555 nm and CIS/ZnS665 nm reveals the correlation between the fast, intermediate, and slow decay components and the interface-trapped state and shallow- and deep-trapped states, although the fractional amplitudes of photoluminescence (PL) decay components are widely distributed throughout the entire spectra. The temperature-resolved spectroscopy explains that the PL from deep-trapped donor-acceptor (DA) state has relatively large thermal quenching, due to the relative Coulomb interaction of DA pairs, compared to the thermal quenching of PL from interface defect state and shallow-trapped DA state. A good spectral coupling between the blue diode excitation and the PL from CIS/ZnS leads to the realization of hybrid white LEDs.

Original languageEnglish
Article number979875
JournalJournal of Nanomaterials
Volume2014
DOIs
StatePublished - 2014

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