Energy transfer dynamics between Alq3 and CdTeS/ZnS core shell nanocrystals

Srivastava

et al. 2010

EPL

A new cadmium complex is synthesized to investigate its stability and applicability for a luminescent device. The as-prepared Cd(Bpy)q sample is characterized by Fourier-transformed infra-red spectroscopy (FTIR), thermal gravimetric analyzer (TGA) and photoluminescence (PL). The prepared sample shows excellent thermal stability up to 380 • C. A maximum is observed at 240 nm in absorption spectra which is attributed to the π-π * transition. An organic-light-emitting diode (OLED) has been fabricated using this material. The fundamental structures of the device exhibit ITO/α-NPD/Cd(Bpy)q/BCP/Alq 3 /LiF/Al. The electroluminescence (EL) device emits bright green light with maximum luminescence 1683 cd/m 2 at 20 V.

mentioning

confidence: 51%

“…There are two components in the decay curve. The curve is fitted by I = a 1 e −t/τ1 + a 2 e −t/τ2 , where τ 1 and τ 2 are the lifetime of the components with amplitude a 1 and a 2 [17]. The lifetimes of the first and second component Fig.…”

mentioning

confidence: 99%

Green-light–emitting electroluminescent device based on a new cadmium complex

Srivastava

et al. 2010

EPL

J. Nano- Electron. Phys.

“…However, both the processes contribute to the energy transfer rate which depends on the acceptor concentration. The decay curve also indicates that the triplet energy transfer is completely suppressed in the aluminium complex [30][31].…”

Section: Spectral Characterization Of the Materialsmentioning

confidence: 83%

“…Decay curve has two components. The curve is fitted by I  a1et/τ1 + a2et/τ2 , where τ1 and τ2 are the lifetime of the components with amplitude al and a2 [30].…”

Section: Spectral Characterization Of the Materialsmentioning

confidence: 99%

Synthesis and Characterization of a New Aluminium Complex Bis (5-choloro-8-hydroxyquinoline)(2,2’bipyridine) Aluminium Al(Bpy)(5-Clq)2

Kumar¹

2017

We have synthesized a new aluminium complex, Bis (5-choloro-8-hydroxyquinoline) (2,2'bipyridine) aluminium Al(Bpy)(5-Clq)2 and characterized it for structural, thermal and photoluminescence properties. The prepared material was characterized by Fourier-transformed infra-red spectroscopy (FTIR), thermal gravimetric analysis (TGA) and photoluminescence. The prepared material showed thermal stability up to 370 C. Absorption Spectra of the material was measured by UV-visible spectroscopy. Solution of Al(Bpy)(5-Clq)2 in ethanol showed peak at 393 nm, which may be attributed due to (- * ) transitions. The photoluminescence spectrum of Al(Bpy)(5-Clq)2 in ethanol solution showed peak at 535 nm. The time resolved photoluminescence spectra of the material showed two life time components. The decay times of the first and second component are 5.3 ns and 21.2 ns respectively. The prepared material emits the light in green region (PL spectra) so it can be used as an emissive layer in organic light emitting diodes.

“…In comparison, other quantum dots (QDs) with interesting emission properties in the near IR have not yet been as extensively examined. CdTeS nanoparticles are potentially superior to CdS for several applications including solar cells because of their additional near IR activity [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

CdS and CdTeS quantum dot decorated TiO₂nanowires. Synthesis and photoefficiency

Medina-González¹,

Xu²,

Chen³

et al. 2011

Nanotechnology

An easy process was developed to synthesize TiO(2) nanowires sensitized with CdS and CdTeS quantum dots (QDs) requiring no pretreatment of the TiO(2) nanowires prior to nanoparticle generation. CdS and CdTeS nanoparticles were firstly grown by an in situ colloidal method directly onto the TiO(2) surface, hence not requiring subsequent functionalization of the QDs. The resulting nanostructure assembly and composition was confirmed by transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Successful decoration of the TiO(2) nanowires by the QDs was observed by TEM, while XPS spectra provided clear evidence for the coexistence of CdS and CdTeS QDs and TiO(2) nanowires. The electronic structure of the TiO(2) nanowires was preserved as indicated by Raman spectroscopy. Preliminary photocurrent measurements showed that inclusion of Te in CdS QDs improved the photocurrent efficiency. Compared to bare TiO(2) nanowires, CdS/TiO(2) nanoassemblies showed an enhancement in photocurrent efficiency of 300% while CdTeS/TiO(2) presented an improvement of 350%. This study indicates that the generation of strongly anchored CdS and CdTeS QDs on a TiO(2) nanowire surface is achievable without introduction of a linker molecule, whose presence is known to decrease the electron injection efficiency.