OSA's Digital Library

Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 9, Iss. 6 — Jun. 1, 2013
  • pp: 433–440

Detailed Study on Pulse-Sprayed Conformal Phosphor Configurations for LEDs

Zong-Tao Li, Yong Tang, Zong-Yuan Liu, Yan-E. Tan, and Ben-Ming Zhu

Journal of Display Technology, Vol. 9, Issue 6, pp. 433-440 (2013)


View Full Text Article

Acrobat PDF (1252 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations
  • Export Citation/Save Click for help

Abstract

We report an investigation of the optical performance of a conformal-shaped phosphor coating fabricated using pulsed spray techniques on horizontal LED chips. Both the nitride and YAG:Ce phosphor mixed configuration and the multilayer configuration were studied. Also, 3535-packaged LED devices with the two typical phosphor configurations were prepared and analyzed. The results revealed that the LED devices with multilayer phosphor configurations emitted an average of 5.6% more radiant flux than those with mixed phosphor configurations. However, such LED devices presented an interesting reversed tendency in the luminosity measurements, which were 0.3 lm and 6 lm lower at 10 mA and 350 mA, respectively. Finally, the color rendering index (CRI) and correlated color temperature (CCT) homogeneity of the LED devices were further analyzed. A twofold reduction in CCT variation was observed compared with the conventional phosphor coating methods. It was found that the mixed phosphor LED devices demonstrated outstanding angular CCT distributions for viewing angles ranging from -80° to 0°, and a CCT variation of only 45 K was detected, while the multilayer phosphor coating had higher color rendering capabilities, reaching a CRIgeneral value as high as 85.6. A promising guideline found through this work is that the pulse-sprayed conformal phosphor configuration would particularly be able to improve the light quality of LED devices by a significant amount: the mixed phosphor configuration achieves excellent CCT homogeneity, and the multilayer phosphor configuration reveals a novel concept for fabricating a low-CCT and high-CRI LED device with less nitride phosphor. The findings of our research should provide valuable insight to LED industries.

© 2012 IEEE

Citation
Zong-Tao Li, Yong Tang, Zong-Yuan Liu, Yan-E. Tan, and Ben-Ming Zhu, "Detailed Study on Pulse-Sprayed Conformal Phosphor Configurations for LEDs," J. Display Technol. 9, 433-440 (2013)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-9-6-433

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited