Low frequency optical noise from organic light emitting diode

Ke, Lin; Chu, Peng; Kumar, Rajesh; Chua, Soo Jin

doi:10.1016/j.sse.2007.07.004

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…developments using organic light emitting diodes which may emit light with higher fluctuations [35][36][37] the incorporation of a monitoring diode could improve the signal quality significantly.…”

Section: Electricalmentioning

confidence: 99%

Flexible planar microfluidic chip employing a light emitting diode and a PIN-photodiode for portable flow cytometers

et al. 2012

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Detection of fluorescence particles is a key method of flow cytometry. We evaluate the performance of a design for a microfluidic fluorescence particle detection device. Due to the planar design with low layer thicknesses, we avoid optical components such as lenses or dichroic mirrors and substitute them with a shadow mask and colored film filters. A commercially available LED is used as the light source and a PIN-photodiode as detector. This design approach reduces component cost and power consumption and enables supplying the device with power from a standard USB port. From evaluation of this design, we obtain a maximum particle detection frequency of up to 600 particles per second at a sensitivity of better than 4.7 × 10(5) MESF (molecules of equivalent soluble fluorochrome) measured with particles for FITC sensitivity calibration. Lowering the flow rate increases the instrument sensitivity by an order of magnitude enabling the detection of particles with 4.5 × 10(4) MESF.

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Section: Electricalmentioning

confidence: 99%

Flexible planar microfluidic chip employing a light emitting diode and a PIN-photodiode for portable flow cytometers

et al. 2012

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“…Both concluded that noise increases with damage level. Another research group reports that the intrinsic transport mechanism greatly influences lowfrequency noise [11].…”

Section: Si(f) = 4k 2 T/r ()mentioning

confidence: 99%

Johnson Noise and Optical Characteristics of Polymer Nanocomposites based on Colloidal Quantum Dots and in-situ Nanoparticles Formation

Naning¹,

Malik²,

Koo³

et al. 2020

Adv. sci. technol. eng. syst. j.

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Electrical and optical properties of polymer nanocomposite thin films have been analyzed to study their reliability and competency as a component for optoelectronic devices such as LED and solar cells. Polymer nanocomposite encounters various challenges, such as the dispersion of nanoparticles in the matrix that hinders their efficiency for potential devices. In this paper, two types of polymer nanocomposites have been fabricated, and their Johnson noise, current density-voltage, and optical have been measured. The first type of nanocomposite produced through an in-situ method, that is by impregnating CdS or CdSe nanoparticles in conjugated polymer, P3HT (NP-CdX:P3HT). The nucleation of the nanoparticles was done using gas exposure. The second type is by directly adding CdS or CdSe quantum dots into P3HT (QD-CdX:P3HT). Both kinds of polymer nanocomposite thin films were fabricated using modified Langmuir-Blodgett technique. Results showed that for frequency above 10 Hz, the Johnson noise was less than 1× 10-27 A2/Hz, regardless of the quantity of quantum dots or nanoparticles. The J-V results show (NP-CdX:P3HT) electrical performance compared with QD-CdX:P3HT. High polymer crystallization of NP-CdX:P3HT thin films is revealed by UV-Vis absorbance spectra. The quantum confinement effect is evidence through peak shifting and depreciation of absorption. The photoluminescence intensity of thin films decreased when they were exposed to the gas. It can be concluded that the NP-CdX:P3HT nanocomposites can be further studied as they have greater potential to be exploited in optoelectronic devices.

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