Wide-range correlated color temperature light generation from resonant cavity hybrid quantum dot light-emitting diodes

Kuo Ju Chen, Chien Chung Lin, Hau Vei Han, Chia Yu Lee, Shih Hsuan Chien, Kuan Yu Wang, Sheng Huan Chiu, Zong Yi Tu, Jie Ru Li, Teng Ming Chen, Xiuling Li, Min Hsiung Shih, Hao Chung Kuo

Research output: Contribution to journalArticle

Abstract

This study presents extremely uniform colloidal quantum dot white light-emitting diodes (QD-WLEDs) that demonstrate a high color rendering index (CRI) and correlated color temperatures (CCTs) ranging from 2500 to 4500 K. Experimental results indicate that the structure of the distributed Bragg reflector (DBR) containing a stopband in the UV region enhances the intensity output of both monochromatic QD-LEDs and QD-WLEDs by reflecting the unconverted UV light back onto the package to excite the QDs further. Furthermore, the angular CCT uniformity of the QD-WLEDs also improved considerably because of the dependence of the DBR structure on the incident angle. The angular CCT deviation in the range of -70° to 70° decreased to 39 K and the CRI of the WLED is higher than 90. The high-CRI and uniform angular CCT QD-WLED containing the DBR demonstrates potential applicability as the lighting source of next-generation display devices and solid-state lighting.

Original languageEnglish (US)
Article number7046267
Pages (from-to)23-29
Number of pages7
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume21
Issue number4
DOIs
StatePublished - Jul 1 2015

Keywords

  • GaN
  • light-emitting diodes (LEDs
  • quantum dots (QDs)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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    Chen, K. J., Lin, C. C., Han, H. V., Lee, C. Y., Chien, S. H., Wang, K. Y., Chiu, S. H., Tu, Z. Y., Li, J. R., Chen, T. M., Li, X., Shih, M. H., & Kuo, H. C. (2015). Wide-range correlated color temperature light generation from resonant cavity hybrid quantum dot light-emitting diodes. IEEE Journal of Selected Topics in Quantum Electronics, 21(4), 23-29. [7046267]. https://doi.org/10.1109/JSTQE.2015.2404877