Abstract

In this work, evidence for matching blue chips with Ce:YAG single crystal phosphor is given. Forward current (${ I} _{\rm f}$) and red phosphor were investigated and discussed to improve the electroluminescent properties of WLEDs using Ce:YAG single-crystal phosphors. Optimum forward current of such a device is chosen at above 45 mA. The structure of ${Sr}_{2}{Si}_{5} {N} _{8}$:${Eu}^{2+}$ phosphor/Ce:YAG single crystal/blue chip enormously improved the color temperature and color rendering index. This method can be a solution to achieve warm white light. The chromaticity of this structure with the color temperature of 5629 K and color rendering index of 77.1 is $({\rm CIE~ x}, {\rm CIE~ y}) = (0.3296, 0.3369)$ closely meeting the demand for ideal white light for general lighting (0.33, 0.33), but the luminous efficiency ($\eta_{\rm L}$) is lower at 81.04 lm/W in comparison to that of the Ce:YAG single crystal/blue chip structure at 94.55$~$lm/W.

© 2015 IEEE

PDF Article

References

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
Login to access OSA Member Subscription

Cited By

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
Login to access OSA Member Subscription