K.Y. Wong | TU Delft Repository

Overdriving reliability of chip scale packaged LEDs

Quantitatively analyzing the impact of component

The objective of this study is to quantitatively evaluate the impacts of LED components on the overdriving reliability of high power white LED chip scale packages (CSPs). The reliability tests under room temperature are conducted over 1000 h in this study on CSP LEDs with overdri ...

Thermal inductance in GaN devices

Using the analogue of the electric inductance, we reveal the properties of the thermal inductance in GaN-based light-emitting diode devices by testing their transient thermal behaviors. We find that the devices exhibit a transient thermal response under step-down or step-up curre ...

Thermal simulation of flexible LED package enhanced with copper pillars

Establishment of the mesoscale parameters for separation: A nonequilibrium molecular dynamics model

A model in predicting color of LED packages with different phosphor layer dimensions

Thermal and mechanical effects of voids within flip chip soldering in LED packages

Two-phase cooling of light emitting diode for higher light output and increased efficiency

Establishment of the coarse grained parameters for epoxy-copper interfacial separation

Nanowire-based gas sensors

Gas sensors fabricated with nanowires as the detecting elements are powerful due to their many improved characteristics such as high surface-to-volume ratios, ultrasensitivity, higher selectivity, low power consumption, and fast response. This paper gives an overview on the recen ...

Molecular model for the charge carrier density dependence of conductivity of polyaniline as chemical sensing materials

We presented a molecular model to investigate the relationship between macroscopic conductivity and charge carrier density in polyaniline (PANI) as chemical sensing materials. It was demonstrated that the conductivity in polyaniline depends on the charge carrier density. The char ...

Molecular modeling of protonic acid doping of emeraldine base polyaniline for chemical sensors

We proposed a molecular modeling methodology to study the protonic acid doping of emeraldine base polyaniline which can be used in gas detection. The commerical forcefield COMPASS was used for the polymer and protonic acid molecules. The molecular model, which is capable of repre ...

Molecular modeling of the conductivity changes of the emeraldine base polyaniline due to protonic acid doping

Establishment of the mesoscale parameters for epoxy-copper interfacial separation

Establishment of the coarse grained parameters for epoxy-copper interfacial separation

Molecular Design of Self-Assembled Monolayer (SAM) Coupling Agent for Reliable Interfaces by Molecular Dynamics Simulation

This chapter aims at developing molecular modeling methodology to select a thiol-based self assembly monolayer (SAM) as a coupling agent for achieving a reliable epoxy-copper interfacial adhesion under moisture conditions. Moisture diffusion and interfacial energy is evaluated us ...

Evaluation and selection of sensing materials for carbon dioxide (CO2) sensor by molecular modeling

We report a molecular modeling study to evaluate and select conducting polymers (CPs) for use as the sensing layer for carbon dioxide (CO2) sensor. The interactions between gases and sensing materials and the adsorptions of small gas molecules on polymer sensing films are describ ...

Validation of forcefields in predicting the physical and thermophysical properties of emeraldine base polyaniline

Journal article (2011) - X Chen (author), Xian-Ping Chen (author), X. Chen (author), Xianping Chen (author), Cadmus Yuan (author), CA Yuan (author), C.A. Yuan (author), KY Wong (author), K.Y. Wong (author), CKY Wong (author), Sau Wee Koh (author), S.W. Koh (author), SW Koh (author), Sau Koh (author), GQ Zhang (author)

We report a molecular modelling study to validate the forcefields [condensed-phase optimised molecular potentials for atomistic simulation studies (COMPASS) and polymer-consistent forcefield (PCFF)] in predicting the physical and thermophysical properties of polymers. This work c ...

Evaluation and selection of sensing materials for carbon dioxide (CO2) sensor by molecular modeling

Conference paper (2011) - XP Chen (author), Xian-Ping Chen (author), CKY Wong (author), KY Wong (author), K.Y. Wong (author), Cadmus Yuan (author), C.A. Yuan (author), CA Yuan (author), GQ Zhang (author)

Impact of the functional group on the working range of polyaniline as carbon dioxide sensors

We present a molecular modeling methodology to investigate the effect of functional group on the working range of polyaniline sensors for carbon dioxide (CO2) in agriculture industry. Doping plays the key role in the sensing mechanism of conducting polymer sensors. The adsorption ...

Molecular dynamics study of the traction-displacement relations of epoxy-copper interfaces