White Light from a Single-Emitter Light-Emitting Electrochemical Cell

Tang, Shi; Pan, Junyou; Buchholz, Herwig; Edman, Ludvig

doi:10.1021/ja312548b

Cited by 91 publications

(64 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In efficient polymer LECs, salt densities of ∼6·10 19 cm −3 are present in the active layer [39]. In case all salt dissociates into ions, such salt densities lead to highly doped regions that can quench all excitons in case they sit close to the recombination zone.…”

Section: Comparison Of Fret and Ctmentioning

confidence: 99%

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

et al. 2014

View full text Add to dashboard Cite

An important loss mechanism in organic electroluminescent devices is exciton quenching by polarons. Gradual electrochemical doping of various conjugated polymer films enabled the determination of the doping density dependence of photoluminescence quenching. Electrochemical doping was achieved by contacting the film with a solid electrochemical gate and an injecting contact. A sharp reduction in photoluminescence was observed for doping densities between 10 18 and 10 19 cm −3 . The doping density dependence is quantitatively modeled by exciton diffusion in a homogeneous density of polarons followed by either Förster resonance energy transfer or charge transfer. Both mechanisms need to be considered to describe polaron-induced exciton quenching. Thus, to reduce exciton-polaron quenching in organic optoelectronic devices, both mechanisms must be prevented by reducing the exciton diffusion, the spectral overlap, the doping density, or a combination thereof.

show abstract

Section: Comparison Of Fret and Ctmentioning

confidence: 99%

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Polymer light-emitting electrochemical cells (LECs) have attracted great interest in recent years due to their complex and yet fascinating operating mechanism as well as their potential applications in display and lighting. [1][2][3][4][5][6][7][8][9][10][11] LECs are solid-state semiconductor devices based on a mixed ionic/ electronic conductor. 12 The operation of LECs under bias involves dynamic electrochemical p-and n-doping of the luminescent polymer and the formation of a light-emitting p-n junction.…”

mentioning

confidence: 99%

Decoupled luminance decay and voltage drift in polymer light-emitting electrochemical cells: Forward bias vs. reverse bias operation

Gao

AlTal

2014

Applied Physics Letters

View full text Add to dashboard Cite

Sandwich polymer light-emitting electrochemical cells (LECs) with low electrolyte loading have been investigated. The LECs can be turned on to emit light at low voltages by applying either a forward- or reverse-bias current. The reverse operation, however, displays significantly higher luminance, frozen-junction behavior, and voltage instability. Moreover, the LECs display de-coupled luminance decay and voltage drift. Under forward-current operation, the luminance decreases for most of the test duration, while the operating voltage remains nearly unchanged. Under reverse-current operation, the luminance remains constant for over 200 h while the operating voltage more than doubles. The highly asymmetric device characteristics between forward and reverse operation can be explained by the different doping profiles created when the initial charge injection barriers are different. Under forward-current operation, the LEC film is predominantly p-doped. This leads to heavy luminescence quenching but a stable operating voltage. Under reverse operation, a predominately n-doped film is responsible for the higher luminance, frozen-junction behavior, and voltage drift. The anomalous device characteristics offer additional insights into the complex operating mechanism of LECs and the behaviours of a doped luminescent polymer.

show abstract

“…For many applications, it is desirable with broadband white emission, and Sun and co-workers reported an LEC based on a single-emitter fluorene-oxadiazole copolymer that featured white emission, albeit with a modest efficiency of CE = 0.15 cd/A [98]. Higher white-emission efficiencies exceeding 3 cd/A have subsequently been reported from LECs based on a single CP emitter [100,114] and a CP blend [99].…”

Section: Performance: Achieving Fast Turn-on High Efficiency and Lomentioning

confidence: 99%

Light-Emitting Electrochemical Cells: A Review on Recent Progress

2016

Self Cite

View full text Add to dashboard Cite

The light-emitting electrochemical cell (LEC) is an area-emitting device, which features a complex turn-on process that ends with the formation of a p-n junction doping structure within the active material. This in-situ doping transformation is attractive in that it promises to pave the way for an unprecedented low-cost fabrication of thin and light-weight devices that present efficient light emission at low applied voltage. In this review, we present recent insights regarding the operational mechanism, breakthroughs in the development of scalable and adaptable solution-based methods for cost-efficient fabrication, and successful efforts toward the realization of LEC devices with improved efficiency and stability.

show abstract

White Light from a Single-Emitter Light-Emitting Electrochemical Cell

Cited by 91 publications

References 52 publications

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

Decoupled luminance decay and voltage drift in polymer light-emitting electrochemical cells: Forward bias vs. reverse bias operation

Light-Emitting Electrochemical Cells: A Review on Recent Progress

Contact Info

Product

Resources

About