Highly efficient phosphorescent organic light-emitting diodes using a homoleptic iridium(III) complex as a sky-blue dopant

Zhuang, Jinyong; Li, Wanfei; Su, Wenming; Liu, Yuan; Shen, Qi; Liao, Liang‐Sheng; Zhou, Ming

doi:10.1016/j.orgel.2013.06.029

Cited by 98 publications

(60 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, the lifetime of managed blue PHOLEDs is at least 30 times longer than previously reported blue PHOLEDs with similar colour coordinates1011. Our strategy contrasts with previous methods that have employed third components192627, but none of which directly address the siphoning of energy from the most vulnerable constituents of blue PHOLEDs; that is, the dopant and host molecules in the EML.…”

mentioning

confidence: 85%

Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes

et al. 2017

View full text Add to dashboard Cite

Since their introduction over 15 years ago, the operational lifetime of blue phosphorescent organic light-emitting diodes (PHOLEDs) has remained insufficient for their practical use in displays and lighting. Their short lifetime results from annihilation between high-energy excited states, producing energetically hot states (>6.0 eV) that lead to molecular dissociation. Here we introduce a strategy to avoid dissociative reactions by including a molecular hot excited state manager within the device emission layer. Hot excited states transfer to the manager and rapidly thermalize before damage is induced on the dopant or host. As a consequence, the managed blue PHOLED attains T80=334±5 h (time to 80% of the 1,000 cd m−2 initial luminance) with a chromaticity coordinate of (0.16, 0.31), corresponding to 3.6±0.1 times improvement in a lifetime compared to conventional, unmanaged devices. To our knowledge, this significant improvement results in the longest lifetime for such a blue PHOLED.

show abstract

mentioning

confidence: 85%

Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes

et al. 2017

View full text Add to dashboard Cite

show abstract

“…For example, even at the luminance of 1000 cd/m 2 , current efficiency as high as 48.79 cd/A can be retained by the device DPP-2 with EQE near 25%. To the best of our knowledge, such performances are amongst the best results achieved from blue phosphorescent biscyclometalated Ir(III) emitters3569. This ascendant result is attributed to more balanced electrons and holes transportation and distribution within emissive layer.…”

mentioning

confidence: 61%

“…Among them, FIrpic is the most widely used blue emitter due to its good device performances, simple molecular structure and ease of synthesis. Although tremendous efforts have been made to develop appropriate host materials and optimize device structures, the efficiency and stability of OLEDs based on FIrpic are still suffering from acid-induced decomposition and poor electron mobility35. It is generally known that charge balance is vital for high efficiency and low efficiency roll-off of OLEDs.…”

mentioning

confidence: 99%

Novel Design of Iridium Phosphors with Pyridinylphosphinate Ligands for High-Efficiency Blue Organic Light-emitting Diodes

Jing

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Due to the high quantum efficiency and wide scope of emission colors, iridium (Ir) (III) complexes have been widely applied as guest materials for OLEDs (organic light-emitting diodes). Contrary to well-developed Ir(III)-based red and green phosphorescent complexes, the efficient blue emitters are rare reported. Like the development of the LED, the absence of efficient and stable blue materials hinders the widely practical application of the OLEDs. Inspired by this, we designed two novel ancillary ligands of phenyl(pyridin-2-yl)phosphinate (ppp) and dipyridinylphosphinate (dpp) for efficient blue phosphorescent iridium complexes (dfppy)2Ir(ppp) and (dfppy)2Ir(dpp) (dfppy = 2-(2,4-difluorophenyl)pyridine) with good electron transport property. The devices using the new iridium phosphors display excellent electroluminescence (EL) performances with a peak current efficiency of 58.78 cd/A, a maximum external quantum efficiency of 28.3%, a peak power efficiency of 52.74 lm/W and negligible efficiency roll-off ratios. The results demonstrated that iridium complexes with pyridinylphosphinate ligands are potential blue phosphorescent materials for OLEDs.

show abstract

“…However, many efforts have been made to improve this dopant since it actually emits more in the greenish blue wavelength range and has a short device lifetime. Zhuang et al 68 developed emitter 71, a homoleptic triscyclometalated iridium(III) complex in which the ligand is substituted as one kind, to compare its EL performance with that of emitter 70 (see Fig. 11).…”

Section: Blue Phosphorescent Dopantsmentioning

confidence: 99%

Recent progress in the use of fluorescent and phosphorescent organic compounds for organic light-emitting diode lighting

et al. 2015

View full text Add to dashboard Cite

Abstract. Organic light-emitting diodes (OLEDs) have attracted considerable attention in both academic and industrial circles. Certain properties of OLEDs make them especially attractive in the lighting market, including area emission characteristics not found in other existing light sources, environmentally friendly efficient use of energy, large area, ultra-light weight, and ultrathin shape. Fluorescent and phosphorescent materials that are being applied to white OLEDs have been categorized, and the chemical structures and device performances of the important blue, orange, and red light-emitting materials have been summarized. Such a systematic classification and understanding of the materials that have already been reported can aid the development and study of new light-emitting materials through quantitative and qualitative approaches.

show abstract

Highly efficient phosphorescent organic light-emitting diodes using a homoleptic iridium(III) complex as a sky-blue dopant

Cited by 98 publications

References 46 publications

Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes

Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes

Novel Design of Iridium Phosphors with Pyridinylphosphinate Ligands for High-Efficiency Blue Organic Light-emitting Diodes

Recent progress in the use of fluorescent and phosphorescent organic compounds for organic light-emitting diode lighting

Contact Info

Product

Resources

About