Correlation of the substitution position of diphenylphosphine oxide on phenylcarbazole and device performances of blue phosphorescent organic light-emitting diodes

Son, Hyo Suk; Seo, Changwoo; Lee, Jun Yeob

doi:10.1039/c0jm03427d

Cited by 48 publications

(45 citation statements)

References 30 publications

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“…Due to the presence of one more diphenylphosphinoe oxide group, the electron mobility of PPO2 (Fig. 247 Besides the MO level, the substitution pattern of the two diphenylphosphoryl units also affects E T of these bipolar hosts. 238 As a result, although PPO2 and PPO1 possess the same E T of 3.02 eV (Table 7), the device using FCNIr-doped PPO2 as an EML shows higher efficiencies (18.4%, 21.1 cd A À1 and 16.6 lm W À1 ) as compared to those of the PPO1-based device (17.1%, 20.5 cd A À1 and 14.3 lm W À1 ), indicating the improved charge carrier transporting balance in the PPO2-based device.…”

Section: View Article Onlinementioning

confidence: 99%

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

2015

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Phosphorescent organic light-emitting devices (OLEDs) have attracted increased attention from both academic and industrial communities due to their potential practical application in high-resolution full-color displays and energy-saving solid-state lightings. The performance of phosphorescent OLEDs is mainly limited by the phosphorescent transition metal complexes (such as iridium(III), platinum(II), gold(III), ruthenium(II), copper(I) and osmium(II) complexes, etc.) which can play a crucial role in furnishing efficient energy transfer, balanced charge injection/transporting character and high quantum efficiency in the devices. It has been shown that functionalized main-group element (such as boron, silicon, nitrogen, phosphorus, oxygen, sulfur and fluorine, etc.) moieties can be incorporated into phosphorescent emitters and their host materials to tune their triplet energies, frontier molecular orbital energies, charge injection/transporting behavior, photophysical properties and thermal stability and hence bring about highly efficient phosphorescent OLEDs. So, in this review, the recent advances in the phosphorescent emitters and their host materials functionalized with various main-group moieties will be introduced from the point of view of their structure-property relationship. The main emphasis lies on the important role played by the main-group element groups in addressing the key issues of both phosphorescent emitters and their host materials to fulfill high-performance phosphorescent OLEDs.

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Section: View Article Onlinementioning

confidence: 99%

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

2015

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“…Main emission peak was observed at 498 nm due to delayed fluorescence of 4CzIPN and a weak shoulder was detected at 470 nm by phosphorescent emission of FIrpic. As the excited state lifetime of FIrpic (1.2 μs)28 is shorter than that of 4CzIPN (5.1 μs)16, the light emission after 1 μs was dominated by 4CzIPN emission. Compared with the prompt PL emission spectrum of mCP:FIrpic:4CzIPN, the 4CzIPN emission was intensified due to delayed emission by reverse intersystem crossing from triplet excited state to singlet excited state.…”

Section: Discussionmentioning

confidence: 95%

Above 20% external quantum efficiency in novel hybrid white organic light-emitting diodes having green thermally activated delayed fluorescent emitter

Kim

Yook

Lee

2014

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High efficiency hybrid type white organic light-emitting diodes (WOLEDs) combining a green thermally activated delayed fluorescent (TADF) emitting material with red/blue phosphorescent emitting materials were developed by manipulating the device architecture of WOLEDs. Energy transfer between a blue phosphorescent emitting material and a green TADF emitter was efficient and could be managed by controlling the doping concentration of emitters. A high quantum efficiency above 20% was achieved in the hybrid WOLEDs by optimizing the device structure of the hybrid type WOLEDs for the first time and the device performances of the hybrid WOLEDs were comparable to those of all phosphorescent WOLEDs. W hite organic light-emitting diodes (WOLEDs) have been developed for application in display and lighting devices [1][2][3] , and one of critical issues of WOLEDs is power efficiency which is determined by driving voltage and external quantum efficiency. In order to improve the power efficiency of WOLEDs, the driving voltage of the WOLEDs should be reduced and the quantum efficiency should be improved. In particular, the quantum efficiency of the WOLEDs should be enhanced for high power efficiency.There have been several approaches to increase the quantum efficiency of WOLEDs. The most effective way was to use phosphorescent emitting materials instead of fluorescent emitting materials as the emitter of WOLEDs 1, [4][5][6][7][8][9][10][11] . The quantum efficiency of WOLEDs could be improved above 20% using the phosphorescent emitters due to theoretically four times higher quantum efficiency of the phosphorescent emitters. Red, green and blue or yellow and blue triplet emitters were mixed in a single emitting layer or stacked in the multilayer structure to fabricate high efficiency WOLEDs. The other way was to combine a blue fluorescent emitter with red and green phosphorescent emitters 2,[12][13][14][15] . In general, blue fluorescent emitters are not compatible with red and green phosphorescent emitters due to triplet exciton quenching of phosphorescent emitters by the fluorescent blue emitters. However, the triplet exciton quenching of red and green phosphorescent emitting materials can be suppressed by adopting high triplet energy blue fluorescent emitting materials 15 . In this case, the singlet excitons of the blue emitting materials are used for blue emission, while the triplet excitons of the blue emitter are utilized for energy transfer to red and blue triplet emitters. Therefore, the combination of the blue fluorescent emitters with red/green phosphorescent emitters could produce high efficiency WOLEDs. However, it was difficult to develop high efficiency and high triplet energy blue fluorescent emitting materials and the efficiency of the hybrid type WOLEDs was rather limited.Recently, thermally activated delayed fluorescence (TADF) emitting materials were developed as high efficiency fluorescent emitting materials [16][17][18][19][20][21][22][23][24][25][26][27] . The TADF emitters could show close to 100% interna...

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“…[17][18][19][20][21][22][23][24] For example, by chemical bonding of both p-and n-type groups into its molecular structure, Cheng et al [ 17 ] developed a bipolar molecular host with an E T of 3.01 eV, and a blue-light-emitting device with an effi ciency of 45.1 cd A − 1 (40.6 lm W − 1 ) was obtained when it was doped with iridium(III)[bis(4,6-difl uorophenyl)-pyridinato-N,C 2 ]-picolinate (FIrpic). Despite these great achievements, polymeric hosts adopting this "bipolar" conception have not been explored for blue-emitting PhPLEDs until now.…”

Section: Doi: 101002/adma201101074mentioning

confidence: 99%

A Novel, Bipolar Polymeric Host for Highly Efficient Blue Electrophosphorescence: a Non‐Conjugated Poly(aryl ether) Containing Triphenylphosphine Oxide Units in the Electron‐Transporting Main Chain and Carbazole Units in Hole‐Transporting Side Chains

et al. 2011

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Correlation of the substitution position of diphenylphosphine oxide on phenylcarbazole and device performances of blue phosphorescent organic light-emitting diodes

Cited by 48 publications

References 30 publications

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

Above 20% external quantum efficiency in novel hybrid white organic light-emitting diodes having green thermally activated delayed fluorescent emitter

A Novel, Bipolar Polymeric Host for Highly Efficient Blue Electrophosphorescence: a Non‐Conjugated Poly(aryl ether) Containing Triphenylphosphine Oxide Units in the Electron‐Transporting Main Chain and Carbazole Units in Hole‐Transporting Side Chains

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