Highly Efficient and Stable White Light‐Emitting Diodes Using Perovskite Quantum Dot Paper

Abstract

Perovskite quantum dots (PQDs) are a competitive candidate for next-generation display technologies as a result of their superior photoluminescence, narrow emission, high quantum yield, and color tunability. However, due to poor thermal resistance and instability under high energy radiation, most PQD-based white light-emitting diodes (LEDs) show only modest luminous efficiency of ≈50 lm W −1 and a short lifetime of <100 h. In this study, by incorporating cellulose nanocrystals, a new type of QD film is fabricated: CH 3 NH 3 PbBr 3 PQD paper that features 91% optical absorption, intense green light emission (518 nm), and excellent stability attributed to the complexation effect between the nanocellulose and PQDs. The PQD paper is combined with red K 2 SiF 6 :Mn4 + phosphor and blue GaN LED chips to fabricate a high-performance white LED demonstrating ultrahigh luminous efficiency (124 lm W −1 ), wide color gamut (123% of National Television System Committee), and long operation lifetime (240 h), which paves the way for advanced lighting technology.

Advances in Quantum-Dot-Based Displays

“…In another research for PQDs-based, Kang et al demonstrated white light emitting diodes (WLEDs) using PQD paper exhibiting an ultrahigh luminous intensity, wide color gamut, and long operational lifetime [78]. The aim of this research was to establish a cost-effective and scalable production technique to resolve high-energy radiation by demonstrating a paper manufacturing process using cellulose nanocrystals (CNCs) to manufacture a new form of PQD film.…”

“…( b ) TEM image of CH 3 NH 3 PbBr 3 PQDs. ( c ) SEM of PQD paper surface [ 78 ]. Figure reproduced with permission from John Wiley and Sons.…”

“…( b ) Current-dependent luminous efficiency and luminous flux of the PQD paper-based LED. ( c ) Time-dependent luminous flux of the LED device under continuous operation [ 78 ]. Figure reproduced with permission from John Wiley and Sons.…”

“… Comparison of device performance between PQD paper-based LED and other reported LEDs using QDs as color converters. ( a ) Luminous efficiency and color gamut performance and ( b ) operational durability of reported QD-based LEDs [ 78 ]. Figure reproduced with permission from John Wiley and Sons.…”

Micro-light-emitting diodes with quantum dots in display technology

“…PQDs are very attractive materials for QDPL-based µ-LEDs because of their excellent optical and physical properties as mentioned above. With superior colour conversion capability to generate RGB lights, PQDs have been utilised in PL-based white LEDs, and ultrahigh luminous efficiency >100 lm/W (the standard for practical use in room lighting) 122 has been achieved. For example, Zhou et al 123 developed PQDembedded polymer composite films for colour conversion, and the resulting white LEDs revealed a luminous efficiency of 109 lm/W and a wide gamut of 121% NTSC.…”