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Proceedings Paper

Realization of quantum dot-based polarized white LEDs using short-wavelength pass dichroic filters and reflective polarizer films
Author(s): Su Ji Yang; Ji Hye Oh; Keyong Nam Lee; Young Rag Do
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Paper Abstract

This study introduces quantum dot (QD)-based polarized white light-emitting diodes (W-LEDs) combined with a shortwavelength pass dichroic filter (SPDF), which transmit blue wavelength regions and reflect yellow wavelength regions, and a reflective polarizer film (RPF)-sandwiched AgIn5S8-ZnS QD layer using an electrospray (e-spray) method. The AgIn5S8-ZnS QDs are good candidates for W-LEDs because of their broad emission band (~100 nm) from the donoracceptor emission. The yellow emitting AgIn5S8-ZnS QDs are synthesized using a colloidal hot injection method and mixed with dimethylformamide (DMF), toluene, and poly(methyl methacrylate) (PMMA) for e-spray coating on glass. Furthermore, SPDFs are used instead of glass substrates to enhance the yellow emission from the QD layer. To create the polarized light, the RPF is fabricated on QD-coated glass and SPDFs. To create white light, a blue LED chip (λmax = 450 nm) is used as the blue light source and an excitation source for the yellow QD film with an applied current of 60 mA. The electroluminescence (EL) intensity with an angular orientation of the polarizer is measured as a function of the polarizer-rotating angle from −90° to 90° at 10° intervals.

Paper Details

Date Published: 25 September 2014
PDF: 6 pages
Proc. SPIE 9190, Thirteenth International Conference on Solid State Lighting, 919012 (25 September 2014); doi: 10.1117/12.2061509
Show Author Affiliations
Su Ji Yang, Kookmin Univ. (Korea, Republic of)
Ji Hye Oh, Kookmin Univ. (Korea, Republic of)
Keyong Nam Lee, Kookmin Univ. (Korea, Republic of)
Young Rag Do, Kookmin Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 9190:
Thirteenth International Conference on Solid State Lighting
Matthew H. Kane; Jianzhong Jiao; Nikolaus Dietz; Jian-Jang Huang, Editor(s)

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