Browsing by Author "Dang C."

Anomalous spectral characteristics of ultrathin sub-nm colloidal CdSe nanoplatelets

Bose S.; Delikanlı, Savaş; Yeltik, Aydan; Sharma, Manoj; Erdem, Onur; Dang C.; Fan W.; Zhang D.H.; Demir, Hilmi Volkan (Optical Society of America, 2017)

We demonstrate high quantum yield broad photoluminescence emission of ultrathin sub-nanometer CdSe nanoplatelets (two-monolayer). They also exhibit polarization-characterized lateral size dependent anomalous heavy hole and ...

Azimuthally polarized, circular colloidal quantum dot laser beam enabled by a concentric grating

Gao, Y.; Tobing, L. Y. M.; Kiffer, A.; Zhang, D. H.; Dang C.; Demir, Hilmi Volkan (American Chemical Society, 2016)

Since optical gain was observed from colloidal quantum dots (CQDs), research on CQD lasing has been focused on the CQDs themselves as gain materials and their coupling with optical resonators. Combining the advantages of ...

Electroluminescence efficiency enhancement in quantum dot light-emitting diodes by embedding a silver nanoisland layer

Yang, X.; Hernandez-Martinez, P. L.; Dang C.; Mutlugün, E.; Zhang, K.; Demir, Hilmi Volkan; Sun X. W. (Wiley-VCH Verlag, 2015)

A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced electroluminescence by embedding a thin layer of Ag nanoislands into hole transport layer. The maximum external quantum efficiency ...

Exciton dynamics in colloidal quantum-dot LEDs under active device operations

Shendre, S.; Sharma, V. K.; Dang C.; Demir, Hilmi Volkan (American Chemical Society, 2018)

Colloidal quantum-dot light-emitting diodes (QLEDs) are lucrative options for color-pure lighting sources. To achieve high-performance QLEDs, besides developing high-efficiency quantum dots (QDs), it is essential to ...

Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots

Gao, Y.; Yu, G.; Wang Y.; Dang C.; Sum, T. C.; Sun, H.; Demir, Hilmi Volkan (American Chemical Society, 2016)

Thanks to their tunability and versatility, the colloidal quantum dots (CQDs) made of II-VI semiconductor compound offer the potential to bridge the "green gap" in conventional semiconductors. However, when the CQDs are ...

High performance infrared photodetectors up to 2.8 μm wavelength based on lead selenide colloidal quantum dots

Thambidurai, M.; Jang, Y.; Shapiro, A.; Yuan, G.; Xiaonan, H.; Xuechao, Y.; Wang, Q. J.; Lifshitz, E.; Demir, Hilmi Volkan; Dang C. (OSA - The Optical Society, 2017)

The strong quantum confinement effect in lead selenide (PbSe) colloidal quantum dots (CQDs) allows to tune the bandgap of the material, covering a large spectral range from mid- to near infrared (NIR). Together with the ...

Low-threshold lasing from colloidal CdSe/CdSeTe core/alloyed-crown type-II heteronanoplatelets

Gao, Y.; Li, M.; Delikanli S.; Zheng, H.; Liu, B.; Dang C.; Sum, T. C.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2018)

Colloidal type-II heterostructures are believed to be a promising solution-processed gain medium given their spatially separated electrons and holes for the suppression of Auger recombination and their wider emission tuning ...

Observation of polarized gain from aligned colloidal nanorods

Gao, Y.; Ta, V. D.; Zhao, X.; Wang Y.; Chen R.; Mutlugün, E.; Fong, K. E.; Tan S.T.; Dang C.; Sun, X. W.; Sun, H.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2015)

In recent years, colloidal semiconductor nanorods have attracted great interest for polarized spontaneous emission. However, their polarized gain has not been possible to achieve so far. In this work we show the highly ...

Temperature-dependent optoelectronic properties of quasi-2D colloidal cadmium selenide nanoplatelets

Bose, S.; Shendre, S.; Song, Z.; Sharma, V. K.; Zhang, D. H.; Dang C.; Fan, W.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2017)

Colloidal cadmium selenide (CdSe) nanoplatelets (NPLs) are a recently developed class of efficient luminescent nanomaterials suitable for optoelectronic device applications. A change in temperature greatly affects their ...

Unraveling exciton kinetics of electroluminescence in colloidal quantum dot LEDs

Shendre S.; Dang C.; Demir, Hilmi Volkan (Optical Society of America, 2016)

We systematically studied emission kinetics of colloidal quantum dots in active light-emitting diodes using time-correlated single photon counting and conclusively revealed the combined effect of both electric field and ...