Resonanta-enhanced fulla-color emission of quantuma dot-based display technology using a pulsed spray method

Kuo Ju Chen, Hsin Chu Chen, Kai An Tsai, Chien-Chung Lin*, Hsin Han Tsai, Shih Hsuan Chien, Bo Siao Cheng, Yung-Jung Hsu, Min Hsiung Shih, Chih Hao Tsai, His Hsin Shih, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

Colloidal quantuma dot lighta emitting diodes (QDLEDs) with the HfO 2/SiO2a distributed Bragg reflector (DBR) structure are fabricated using a pulsed spray coating method. Pixelated RGB arrays, 2-in. wafera scale white light emission, and an integrated small footprint white light device are demonstrated. The experimental results show that the intensity of red, green, and blue (RGB) emission exhibited considerable enhancement because of the high reflectivity in the UV region by the DBR structure, which subsequently increases the use in the UV optical pumping of RGB QDs. A pulsed spray coating method is crucial in providing uniform RGB layers, and the polydimethylsiloxane (PDMS) film is used as the interface layer between each RGB color to avoid crossa contamination and self-assembly of QDs. Furthermore, the chromaticity coordinates of QDLEDs with the DBR structure remain constant under various pumping powers in the large area sample, whereas a larger shift toward high color temperatures is observed in the integrated device. The resulting color gamut of the proposed QDLEDs covers an area 1.2 times larger than that of the NTSC standard, which is favorable for the next generation of higha-quality display technology.

Original languageEnglish
Pages (from-to)5138-5143
Number of pages6
JournalAdvanced Functional Materials
Volume22
Issue number24
DOIs
StatePublished - 19 Dec 2012

Keywords

  • lighta emitting diodes
  • quantum dots
  • resonant cavity enhanced devices

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