Stationary and adaptive color-shift reduction methods based on the bilevel driving technique for phosphor-converted white LEDs
The bilevel driving technique has realized a 2-D control of the luminosity and emitted color
of white LEDs with duty cycle and forward current levels. Unfortunately, various …
of white LEDs with duty cycle and forward current levels. Unfortunately, various …
On the color stability of phosphor-converted white LEDs under DC, PWM, and bilevel drive
Most commercial white LEDs are made from nitride-based blue LEDs coated with yttrium
aluminium garnet phosphor, which produce spectra that shift in opposite directions under …
aluminium garnet phosphor, which produce spectra that shift in opposite directions under …
Nonlinear dimming and correlated color temperature control of bicolor white LED systems
This paper proposes a nonlinear approach of controlling the luminous intensity and
correlated color temperature (CCT) of white light-emitting diode (LED) systems with dual …
correlated color temperature (CCT) of white light-emitting diode (LED) systems with dual …
Color variation reduction of GaN-based white light-emitting diodes via peak-wavelength stabilization
The color, electrical, and thermal properties of LED devices are highly dependent on one
another. The peak wavelength of GaN-based white LED shifts in opposite directions under …
another. The peak wavelength of GaN-based white LED shifts in opposite directions under …
Luminous flux and CCT stabilization of white LED device with a bilevel driver
H Chen, X Zhou, S Lin, J Liu - IEEE Photonics Journal, 2018 - ieeexplore.ieee.org
The optical, color, electrical, and thermal properties of an LED devices are highly dependent
on one another. The luminous flux variation and correlated color temperature (CCT) shifting …
on one another. The luminous flux variation and correlated color temperature (CCT) shifting …
Impact of dimming white LEDs: chromaticity shifts due to different dimming methods
M Dyble, N Narendran, A Bierman… - … conference on solid …, 2005 - spiedigitallibrary.org
The goal of this study was to characterize the chromaticity shift that mixed-color and
phosphor-converted white LED systems undergo when dimmed. As light-emitting diodes …
phosphor-converted white LED systems undergo when dimmed. As light-emitting diodes …
A novel color control method for multicolor LED systems to achieve high color rendering indexes
X Zhan, W Wang, HSH Chung - IEEE Transactions on Power …, 2017 - ieeexplore.ieee.org
A novel color control method for multicolor light-emitting-diode (LED) systems is proposed.
The proposed control method can achieve high color rendering indexes by approximating …
The proposed control method can achieve high color rendering indexes by approximating …
Chromaticity stability of phosphor-converted white light-emitting diodes with an optical filter
JC Su, SF Song, HS Chen - Applied Optics, 2011 - opg.optica.org
The thermal stability of blue LEDs and yellow YAG phosphor for blue-pumped white LEDs is
critical to the performance of white LEDs, including the color properties and luminous …
critical to the performance of white LEDs, including the color properties and luminous …
Accurate chromatic control and color rendering optimization in LED lighting systems using junction temperature feedback
MM Sisto, J Gauvin - Thirteenth International Conference on …, 2014 - spiedigitallibrary.org
Accurate color control of LED lighting systems is a challenging task: noticeable chromaticity
shifts are commonly observed in mixed-color and phosphor converted LEDs due to intensity …
shifts are commonly observed in mixed-color and phosphor converted LEDs due to intensity …
Color control system for RGB LED with application to light sources suffering from prolonged aging
This paper presents a unified approach to controlling the white color point of the
red/green/blue (RGB) light-emitting diode (LED) existing in all aging states. In contrast to …
red/green/blue (RGB) light-emitting diode (LED) existing in all aging states. In contrast to …