Novel iridium complexes as high-efficiency yellow and red phosphorescent light emitters for organic light-emitting diodes

Yao, Jun; Zhen, Changgua; Loh, Kian Ping; Chen, Zhi-Kuan

doi:10.1016/j.tet.2008.09.033

Cited by 38 publications

(25 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is noted that η power of the Y‐Pt ‐based devices can achieve over 50 lm W −1 . Notably, the overall performance in terms of Φ L and η power of Y‐Pt is comparable to those of the best reported iridium(III)4, 5, 15–19 or even better than those of platinum(II)12, 13, 20, 21 based yellow light‐emitting phosphors.…”

Section: Resultsmentioning

confidence: 64%

High Efficiency White Organic Light‐Emitting Devices Incorporating Yellow Phosphorescent Platinum(II) Complex and Composite Blue Host

Lai

Tong

Kui

et al. 2013

Adv Funct Materials

View full text Add to dashboard Cite

A new class of charge neutral, strongly luminescent cyclometalated platinum(II) complexes supported by dianionic tetradentate ligand are synthesized. One of these platinum(II) complexes, Y‐Pt, displays a high photoluminescence quantum yield of 86% and electroluminescence efficacy (ηpower) of up to 52 lm W−1, and is utilized as a yellow phosphorescent dopant in the fabrication of white organic light‐emitting devices (WOLEDs). WOLEDs based on conventional structures with yellow emission from Y‐Pt in combination with blue emission from bis(4,6‐difluorophenyl‐pyridinato‐N,C2′) (picolinate) iridium(III) (FIrpic) show a total ηpower of up to 31 lm W−1. A two‐fold increase in ηpower by utilizing a modified WOLED structure comprising of a composite blue host is realized. With this modified device structure, the total ηpower and driving voltage at a luminance of 1000 cd m−2 can be improved to 61 lm W−1 and 7.5 V (i.e., 10 V for control devices). The performance improvement is attributed to an effectively broaden exciton formation‐recombination zone and alleviation of localized exciton accumulation within the FIrpic‐doped composite host for reduced triplet‐triplet annihilation, yielding blue light‐emission with enhanced intensity. The modified device structure can also adopt a higher concentration of Y‐Pt towards its optimal value, leading to WOLEDs with high efficiency.

show abstract

Section: Resultsmentioning

confidence: 64%

High Efficiency White Organic Light‐Emitting Devices Incorporating Yellow Phosphorescent Platinum(II) Complex and Composite Blue Host

Lai

Tong

Kui

et al. 2013

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…In 2008, Chen et al established an amorphous spiro-annulated structure on (ppy) 2 Ir(acac) by using the spirobifluorene moiety, aiming to address the crystallization and self-quenching problems in thin film. 86 The modified Ir(III) complexes C1 (Ir-64) (F = 0.52) and C3 (Ir-65) (F = 0.55) exhibited emission peaks at 548 nm and 555 nm in CH 2 Cl 2 solution, respectively. In the PhOLEDs co-hosted by PVK and PBD by a solution process, the highest efficiencies (max.…”

Section: Functional Group-/substituent-modified Ir(iii) Complexesmentioning

confidence: 97%

Yellow/orange emissive heavy-metal complexes as phosphors in monochromatic and white organic light-emitting devices

2014

View full text Add to dashboard Cite

Owing to the electron spin-orbit coupling (SOC) and fast intersystem crossing (ISC), heavy-metal complexes (such as iridium(III), platinum(II) and osmium(II) complexes, etc.) are phosphorescent emitters at room temperature. Since 1998, heavy-metal complexes as phosphors have received considerable academic and industrial attention in the field of organic light-emitting diodes (OLEDs), because they can harvest both the singlet (25%) and triplet (75%) excitons for emission during the electro-generated processes. Among all the visible colors (blue, green, yellow, orange and red), the yellow/orange heavy-metal complexes play an important role for realizing full-color OLEDs as well as high-efficiency white OLEDs, and thus the development of highly efficient yellow/orange heavy-metal complexes is a pressing concern. In this article, we will review the progress on yellow/orange heavy-metal complexes as phosphors in OLEDs. The general principles and useful tactics for designing the yellow/orange heavy-metal complexes will be systematically summarized. The structure-property relationship and electrophosphorescence performance of the yellow/orange heavy-metal complexes in monochromatic phosphorescent OLEDs (PhOLEDs) and white OLEDs (WOLEDs) will be comprehensively surveyed and discussed.

show abstract

“…The calculated results show that the optical and electronic properties of star-shaped molecules are affected by the substituent groups in N-position of 1,8-naphthalimide ring. Our results suggest that star-shaped molecules with n-butyl (1), Benzene (2), Thiophene (3), thiophene S',S'-dioxide (4), benzo[c] [1,2,5]thiadiazole (5), and 2,7a-dihydrobenzo [d] thiazole (6) fragments are expected to be promising candidates for luminescent and electron transport materials for OLEDs. This study should be helpful in further theoretical investigations on such kind of systems and also to the experimental study for charge transport and/or luminescent materials for OLEDs.…”

Section: Introductionmentioning

confidence: 93%

“…Organic light-emitting diodes (OLEDs) have received considerable interest due to their promising applications in the large-area flat-panel displays and solid-state lighting [1][2][3][4][5][6]. The devices using organic materials have shown several advantages over their inorganic counterparts, for example, light weight, potentially low cost, capability of thin-film, largearea, and flexible device fabrication, and wide selection of emission colors via molecular design of organic materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rational Design of Star-Shaped Molecules with Benzene Core and Naphthalimides Derivatives End Groups as Organic Light-emitting Materials

2014

Organic Chem Curr Res

View full text Add to dashboard Cite

Novel iridium complexes as high-efficiency yellow and red phosphorescent light emitters for organic light-emitting diodes

Cited by 38 publications

References 39 publications

High Efficiency White Organic Light‐Emitting Devices Incorporating Yellow Phosphorescent Platinum(II) Complex and Composite Blue Host

High Efficiency White Organic Light‐Emitting Devices Incorporating Yellow Phosphorescent Platinum(II) Complex and Composite Blue Host

Yellow/orange emissive heavy-metal complexes as phosphors in monochromatic and white organic light-emitting devices

Rational Design of Star-Shaped Molecules with Benzene Core and Naphthalimides Derivatives End Groups as Organic Light-emitting Materials

Contact Info

Product

Resources

About