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

Hong Luo; Jong Kyu Kim; E. Fred Schubert; Jaehee Cho; Cheolsoo Sone; Yongjo Park

doi:10.1063/1.1949282

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

Hong Luo
, Jong Kyu Kim
, E. Fred Schubert
, Jaehee Cho
, Cheolsoo Sone
, Yongjo Park

Department of Semiconductor Science and Technology

Rensselaer Polytechnic Institute
Samsung

Research output: Contribution to journal › Journal article › peer-review

284 Scopus citations

Abstract

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.

Original language	English
Article number	243505
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	24
DOIs	https://doi.org/10.1063/1.1949282
State	Published - 2005.06.13

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10.1063/1.1949282

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title = "Analysis of high-power packages for phosphor-based white-light-emitting diodes",

abstract = "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.",

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year = "2005",

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doi = "10.1063/1.1949282",

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AU - Luo, Hong

AU - Kim, Jong Kyu

AU - Schubert, E. Fred

AU - Cho, Jaehee

AU - Sone, Cheolsoo

AU - Park, Yongjo

PY - 2005/6/13

Y1 - 2005/6/13

N2 - 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.

AB - 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.

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

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