Efficient non-doped monochrome and white phosphorescent organic light-emitting diodes based on ultrathin emissive layers

Xue, Kaiwen; Sheng, Ren; Duan, Yu; Chen, Ping; Chen, Bingye; Xiao, Wang; Duan, Yahui; Zhao, Yi

doi:10.1016/j.orgel.2015.08.017

Cited by 54 publications

(40 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, OLEDs with dopant-free and ultrathin emissive layers (UEMLs) have aroused much attention 22 23 24 25 26 27 28 29 30 31 32 . Chen et al 23 replaced conventional host-dopant systems with non-doped ultrathin bluish-green and red dyes to achieve high-efficiency white OLEDs.…”

mentioning

confidence: 99%

Highly Efficient White Organic Light-Emitting Diodes with Ultrathin Emissive Layers and a Spacer-Free Structure

Sun

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Ultrathin emissive layers (UEMLs) of phosphorescent materials with a layer thickness of less than 0.3 nm were introduced for high-efficiency organic light-emitting diodes (OLEDs). All the UEMLs for white OLEDs can be prepared without the use of interlayers or spacers. Compared with devices fabricated with interlayers inserted in-between the UEMLs, our spacer-free structure not only significantly improves device efficiency, but also simplifies the fabrication process, thus it has a great potential in lowering the cost of OLED panels. In addition, its spacer-free structure decreases the number of interfaces which often introduce unnecessary energy barriers in these devices. In the present work, UEMLs of red, green and blue-emitting phosphorescent materials and yellow and blue phosphorescent emitters are utilized for the demonstration of spacer-free white OLEDs. Upon optimization of the device structure, we demonstrated spacer-free and simple-structured white-emitting OLEDs with a good device performance. The current and power efficiencies of our white-emitting devices are as high as 56.0 cd/A and 55.5 lm/W, respectively. These efficiencies are the highest ever reported for OLEDs fabricated with the UEML approach.

show abstract

mentioning

confidence: 99%

Highly Efficient White Organic Light-Emitting Diodes with Ultrathin Emissive Layers and a Spacer-Free Structure

Sun

et al. 2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…In general, the emitting layers (EML) of PHOLEDs employ host‐guest systems, in which a host material having excellent carrier transport capability can be combined with the guest to realize high luminous efficiency and reduce efficiency roll‐off . However, the doping fabrication process is relatively complicated and the doping concentration is not easy to control precisely …”

Section: Introductionmentioning

confidence: 99%

High Efficiency Non‐Doped White Organic Light Emitting Diodes Based on a Bilayer Interface‐Exciplex Structure

Wang

Dong

et al. 2019

Physica Status Solidi (a)

View full text Add to dashboard Cite

High efficiency non-doped blue and white organic light emitting diodes (OLEDs) are realized by using a bilayer interface-exciplex (i-Exc) structure. Since the neutral exciplex are formed at the interface, the interface charge accumulation is reduced, thereby suppressing exciton quenching in the device. With the i-Exc structure, a maximum external quantum efficiency (EQE) of 23.1% is achieved in the non-doped blue phosphorescent OLED. Moreover, the white emission can be obtained by inserting an ultrathin orange-red phosphorescent emitter into the blue devices. The charge trapping in the orange-red emitter can be suppressed by adjusting the position of the ultrathin orange-red emitting layer in the device, contributing to superior spectral stability. The WOLED achieves an EQE of 20.0% and exhibits a stable warm white emission. The Commission Internationale de l'Eclairage (CIE) coordinates of WOLED are (0.41, 0.40) at 5 V and slightly change to (0.40, 0.41) at 9 V.

show abstract

“…Nowadays, many approaches have been reported to develop high-performance WOLEDs, including managing singlet and triplet excitons for hybrid structures [72][73][74][75], harvesting triplets from blue fluorophors with high T 1 [76][77][78][79][80], having charge-and exciton-confining structures to reduce the efficiency roll-off [81][82][83], combining blue/green/red phosphors with light-outcoupling enhancement techniques [84], adopting color down-conversion media [85], comprising ultrathin emitting layers (EMLs) [86][87][88][89][90], using tandem architectures [91][92][93][94][95], employing excimer systems [96][97][98], eliminating interlayer in hybrid WOLEDs [99,100], and exploiting double multifunctional blue EMLs [101]. Among them, the use of exciplexes in WOLEDs has been actively investigated, since exciplexes can be effectively functioned as (i) fluorescent or TADF emitters; (ii) the hosts of fluorescent, phosphorescent and TADF dopants [102][103][104][105][106][107][108][109][110].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances of Exciplex-Based White Organic Light-Emitting Diodes

Xiao

Huang

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

Recently, exciplexes have been actively investigated in white organic light-emitting diodes (WOLEDs), since they can be effectively functioned as (i) fluorescent or thermally activated delayed fluorescent (TADF) emitters; (ii) the hosts of fluorescent, phosphorescent and TADF dopants. By virtue of the unique advantages of exciplexes, high-performance exciplex-based WOLEDs can be achieved. In this invited review, we have firstly described fundamental concepts of exciplexes and their use in organic light-emitting diodes (OLEDs). Then, we have concluded the primary strategies to develop exciplex-based WOLEDs. Specifically, we have emphasized the representative WOLEDs using exciplex emitters or hosts. In the end, we have given an outlook for the future development of exciplex-based WOLEDs.

show abstract

Efficient non-doped monochrome and white phosphorescent organic light-emitting diodes based on ultrathin emissive layers

Cited by 54 publications

References 45 publications

Highly Efficient White Organic Light-Emitting Diodes with Ultrathin Emissive Layers and a Spacer-Free Structure

Highly Efficient White Organic Light-Emitting Diodes with Ultrathin Emissive Layers and a Spacer-Free Structure

High Efficiency Non‐Doped White Organic Light Emitting Diodes Based on a Bilayer Interface‐Exciplex Structure

Recent Advances of Exciplex-Based White Organic Light-Emitting Diodes

Contact Info

Product

Resources

About