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

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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
Article number7046267
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume21
Issue number4
DOIs
StatePublished - 1 Jul 2015

Keywords

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

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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 on Selected Topics in Quantum Electronics, 21(4), [7046267]. https://doi.org/10.1109/JSTQE.2015.2404877