Advances and Challenges in White Light‐Emitting Electrochemical Cells. (12th March 2020)

• Record Type: Journal Article
• Authors: Fresta, Elisa; Costa, Rubén D.
• Is Part Of: Advanced functional materials. Volume 30:Number 33(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-03-12
• Subjects: electroluminescence -- light‐emitting electrochemical cells -- thin‐film lighting -- white lighting sources; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201908176
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Since the birth of light‐emitting electrochemical cells (LECs) in 1995, white LECs (WLECs) still represent a milestone. To date, over 50 contributions have been reported, presenting record WLECs with brightness of up to 10 000 cd m −2, efficiencies of >10 cd A −1, and excellent color rendering index >90 in different contributions. This is achieved following three main strategies focused on modifying: i) the design of the emitters, that is, emissive aggregates, multiemissive mechanism, multifluorophoric emitters; ii) the active layer composition, that is, host–guest, multilayers, exciplex‐ and electroplex‐like emitting species systems; and iii) the device architecture, that is, tandem, photoactive filters, and microcavity/interfacial dipole effects. Herein, all of them are comprehensively discussed with respect to the above strategies in the frame of the type of emitters employed. Overall, this work highlights both the advances and challenges of the WLEC field. Abstract : White light‐emitting electrochemical cells still represent one of the most important milestones in this field. Three main strategies have been pursued modifying i) the emitter design, ii) the active layer composition, and iii) the device architecture. This work comprehensively discusses them within the frame of the type of emitters, highlighting the advances and challenges.