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Solution-Processed CuInS2-Based White QD-LEDs with Mixed Active Layer Architecture

Author:
Wepfer, Svenja, Frohleiks, Julia, Hong, A-Ra, Jang, Ho Seong, Bacher, Gerd, Nannen, Ekaterina
Source:
ACS Applied Materials & Interfaces 2017 v.9 no.12 pp. 11224-11230
ISSN:
1944-8252
Subject:
color, quantum dots, temperature, white light, zinc sulfide
Abstract:
Colloidal quantum dots (QDs) are attractive candidates for future lighting technology. However, in contrast to display applications, the realization of balanced white lighting devices remains conceptually challenging. Here, we demonstrate two-component white light-emitting QD-LEDs with high color rendering indices (CRI) up to 78. The implementation of orange CuInSâ‚‚/ZnS (CIS/ZnS) QDs with a broad emission and high quantum yield together with blue ZnCdSe/ZnS QDs in a mixed approach allowed white light emission with low blue QD content. The devices reveal only a small color drift in a wide operation voltage range. The correlated color temperature (CCT) could be adjusted between 2200 and 7200 K (from warm white to cold white) by changing the volume ratio between orange and blue QDs (1:0.5 and 1:2).
Agid:
5659331