Using quantum dot photoluminescence for load detection

Journal Article · Mon Aug 15 04:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4961145· OSTI ID:22611409

Hartwig, M. ^[1]; Martin, J. ^[2]; Baumann, R. R.; Otto, T.; Gessner, T. ^[1]

---

1. Technische Universität Chemnitz, Reichenhainer Straße, 09126 Chemnitz (Germany)
2. Fraunhofer Institute for Electronic Nano Systems, Technologie-Campus 3, 09126 Chemnitz (Germany)

We propose a novel concept for an integrable and flexible sensor capable to visualize mechanical impacts on lightweight structures by quenching the photoluminescence (PL) of CdSe quantum dots. Considering the requirements such as visibility, storage time and high optical contrast of PL quenching with low power consumption, we have investigated a symmetrical and an asymmetrical layer stack consisting of semiconductor organic N,N,N′,N′-Tetrakis(3-methylphenyl)-3,3′-dimethylbenzidine (HMTPD) and CdSe quantum dots with elongated CdS shell. Time-resolved series of PL spectra from layer stacks with applied voltages of different polarity and simultaneous observation of power consumption have shown that a variety of mechanisms such as photo-induced charge separation and charge injection, cause PL quenching. However, mechanisms such as screening of external field as well as Auger-assisted charge ejection is working contrary to that. Investigations regarding the influence of illumination revealed that the positive biased asymmetrical layer stack is the preferred sensor configuration, due to a charge carrier injection at voltages of 10 V without the need of coincident illumination.

• OSTI ID: 22611409
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 8 Vol. 6; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CADMIUM SELENIDES
CADMIUM SULFIDES
CHARGE CARRIERS
DETECTION
ELECTRIC POTENTIAL
ILLUMINANCE
INJECTION
LAYERS
ORGANIC SEMICONDUCTORS
PHOTOLUMINESCENCE
QUANTUM DOTS
QUENCHING
SEMICONDUCTOR MATERIALS
SENSORS
SPECTRA
STORAGE
TIME RESOLUTION