High-efficiency white LED packaging with reduced phosphor concentration

Ching Yi Chen, Tsung Hsun Yang, Chien Hung Hsu, Ching Cherng Sun

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


In this letter, important factors for white light emitting diodes (LED) packaging, including lens encapsulation, reflectivity of cavity reflectors, and phosphor concentration are studied. Simulation as well as the corresponding experiment shows that reflectivity of the reflectors in packaging cavity is more effective than lens encapsulation to reach high efficiency. Besides, a white LED packaging without lens encapsulation but with high reflectivity of cavity reflectors may increase interaction possibility between blue photons and the phosphor so that the phosphor concentration can be reduced to meet the requested correlated color temperature.

Original languageEnglish
Article number6473826
Pages (from-to)694-696
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number7
StatePublished - 2013


  • Light emitting diodes
  • phosphors
  • photon recycling


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