- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Luminescence Line Broadening of CdSe Nanoplatelets and Quantum Dots for Application in w-LEDs
摘要： Nanoplatelets (NPLs) of CdSe are an emerging class of luminescent materials, combining tunable and narrow emission bands with high quantum yields. This is promising for application in white light LEDs (w-LEDs) and displays. The origin of the narrow spectral width of exciton emission in core NPL compared to core-shell NPL and quantum dot (QD) emission is not fully understood. Here we investigate and compare temperature dependent emission spectra of core and core-shell CdSe NPLs and QDs. A wide temperature range, 4 to 423 K, is chosen to gain insight in contributions from homogeneous and inhomogeneous broadening and also to extend measurements into a temperature regime that is relevant for operating conditions in w-LEDs (T~423 K). The results show that temperature induced homogeneous broadening does not strongly vary between the various CdSe nanostructures (ΔEhom≈60-80 meV at 423 K) indicating that electron-phonon coupling strengths are similar. Only for the smallest QDs stronger coupling is observed. The origin of the narrow bandwidth reported at 300 K for core CdSe NPLs is attributed to a very narrow inhomogeneous linewidth. At 423 K the spectral width of NPL exciton emission is still superior to that of QDs. A comparison with traditional w-LED phosphors is made to outline advantages (tunability, narrow bandwidth, high efficiency) and disadvantages (color shift, stability issues) of NPLs for application in w-LEDs.
关键词： w-LEDs,Quantum Dots,Temperature dependent emission spectra,CdSe Nanoplatelets,Luminescence
更新于2025-09-23 15:21:01
-
P-9.11: Synthesis and optical properties of CdSe <sub/>x</sub> S <sub/>1-x</sub> nanomaterials with different morphologies
摘要： The optical properties of colloidal nanometer quantum dots, including fluorescence peak position, fluorescence peak width, fluorescence quantum yield, fluorescence attenuation channel, fluorescence scintillation and brightness of single quantum dots, are determined by the properties of Exciton states, and the properties of Exciton states are closely related to their structure. During the synthesis of CdSexS1-x Nanomaterials, a series of different morphologies are obtained by controlling the reaction solvent, reaction temperature, reaction time, type and concentration of the reaction ligand and the precursor type CdSeXS1-x nanomaterial.
关键词： CdSe,Nanoplatelets,Nanorods,Quantum Dots
更新于2025-09-19 17:15:36