Analysis of high-power packages for phosphor-based white-light-emitting diodes

By Hong Luo, Jong Kyu Kim, E. Fred Schubert, Jaehee Cho, C. Sone, Yongjo Park. 2005

258 citations recorded by the source corpus.

An optimized packaging configuration for high-power white-light-emitting diode (LED) lamps that employs a diffuse reflector cup, a large separation between the primary emitter (the LED chip) and the wavelength converter (the phosphor) and a hemispherically shaped encapsulation is presented. Ray tracing simulations for this configuration show that the phosphor efficiency can be enhanced by up to 50% over conventional packages. Dichromatic LED lamps with phosphor layers on the top of a diffuse reflector cup were fabricated and studied experimentally. The experimental enhancement of phosphor efficiency is 15.4% for blue-pumped yellow phosphor and 27% for ultraviolet-pumped blue phosphor. Those improvements are attributed to reduced absorption of the phosphorescence by the LED chip and the reduction of deterministic optical modes trapped inside the encapsulant.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/83c844ab59c4cb6fda787148b6577b2e008ceed5

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

A. I. Zhmakin

In Condensed Matter Physics

In Electrical and Electronic Engineering

Citations in the corpus

Solid-state lighting—a benevolent technology (2006, background): “The phosphor forms a uniform layer on the top of the reflector cup, which we refer to as remote phosphor [17,18].”
Heat and fluid flow in high-power LED packaging and applications (2016, background): “In this coating process, since only a small part of the light rays will reach the chip and be absorbed, adjusting the phosphor layer from being close to being remote to the chip can reduce the backscattering incidents and increase light extraction [70,71].”
Enhancement of light extraction from light emitting diodes (2011, background): “The study of the phosphorescence efficiency for different proximate and remote phosphor configurations for the cases of flat, convex or semispherical shapes of the encapsulant top surface showed that the remote phosphor [120–123] and”
Optical Analysis of Color Distribution in White LEDs With Various Packaging Methods (2008, methodology): “Researchers and corporations proposed another packaging method that fabricated the phosphor layer in remote location [5].”
Light emitting diodes reliability review (2012, methodology): “[156] minimized the optical losses by utilizing a diffuse reflector cup, a remote-type phosphor layer, and a”