The stability improvement of wide emission Zn0.8Cd0.2S quantum dot for white light-emitting diodes

Cyuan-Bin Siao; Shu-Ru Chung; Kuan-Wen Wang

doi:10.1117/12.2236318

7 September 2016 The stability improvement of wide emission Zn_0.8Cd_0.2S quantum dot for white light-emitting diodes

Cyuan-Bin Siao, Shu-Ru Chung, Kuan-Wen Wang

Proceedings Volume 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems; 995409 (2016) https://doi.org/10.1117/12.2236318
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

Recently, the investigation of quantum dots (QDs) as color converters for white light-emitting diodes (WLEDs) has attracted a significant amount of attention, because the emission wavelength and broad excitation band of QDs can be controlled by their particle sizes and compositions. However, owing to the thermal effect, the long-term stability of QDWLEDs is one of the important tasks for their application. Moreover, the commercial WLEDs have low color rendering index (CRI) and the reabsorption effect. Therefore, in order to increase the device stability and CRI, in this study, we have used easy one-pot process to synthesize the colloidal ternary Zn_0.8Cd_0.2S (ZnCdS) QDs with wide emission, a quantum yield (QY) of 42 % and a particle size of 3.2 ± 0.5 nm. Three methods have been applied to encapsulate the QDs and their average CRIs are 78. We have demonstrated that the QDs-based WLEDs can achieve color converter robust against photooxidation, thermal quenching, and scattering, and can be applied to fabricate reliable P-QD1 device with an air gap between the emission layers. This encapsulation setup can protect the color converter and maintain the best stability over 750 hours operation time, and the Commission International d’Eclairage (CIE) chromaticity coordinates and luminous efficacy can be tuned from (0.36, 0.40) to (0.32, 0.33) and 4.5 to 3.2, respectively.

Citation Download Citation

Cyuan-Bin Siao, Shu-Ru Chung, and Kuan-Wen Wang "The stability improvement of wide emission Zn_0.8Cd_0.2S quantum dot for white light-emitting diodes", Proc. SPIE 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 995409 (7 September 2016); https://doi.org/10.1117/12.2236318

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Ultraviolet radiation

Light emitting diodes

Luminous efficacy

Quantum dots

Atmospheric particles

Thermal effects

Optical properties

Show All Keywords

Keywords/Phrases

Search In:

Publication Years