Simultaneous harvesting of triplet excitons in OLEDs by both guest and host materials with an intramolecular charge-transfer feature via triplet-triplet annihilation

	Simultaneous harvesting of triplet excitons in OLEDs by both guest and host materials with an intramolecular charge-transfer feature via triplet-triplet annihilation
	Zheng, X. J.; Q. M. Peng; J. Lin; Y. Wang; J. Zhou; Y. Jiao; Y. F. Bai; Y. Huang; F. Li; X. Y. Liu; X. M. Pu and Z. Y. Lu
	2015
发表期刊	Journal of Materials Chemistry C
卷号	3 期号:27 页码:6970-6978
摘要	A red naphthalimide derivative with an intramolecular charge-transfer (ICT) feature, namely (E)-2-(4-(t-butyl)-phenyl)-6-(2-(6-(diphenylamino)naphthalen-2-yl)vinyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione (NA-TNA), was designed and synthesized. Photophysical and magneto-electroluminescence (MEL) characterization results revealed that NA-TNA could harvest triplet excitons via a triplet-triplet annihilation (TTA) process in organic light-emitting diodes (OLEDs) due to the presence of a lower-lying triplet excited state with (3)pi pi* character. Consequently, using NA-TNA as a guest compound and CzPhONI, another ICT-featured naphthalimide derivative with triplet fusion delayed fluorescence (TFDF) character as host material, a high-performance orange OLED with 6 wt% NA-TNA doped CzPhONI film as the emitting layer was acquired. The maximum current efficiency (LEmax), brightness (L-max), and external quantum yield (EQE(max)) of this OLED is 7.73 cd A(-1), 31940 cd m(-2) and 5.83%, respectively, while the theoretical EQE(max) of this device should not exceed 3.34%. On the contrary, the reference device with a NA-TNA doping level of 1.4 wt% showed much inferior performance, with a LEmax, a L-max, and an EQE(max) of 3.19 cd A(-1), 24 900 cd m(-2) and 2.49%, respectively. The high performance of the 6 wt% NA-TNA doped device was attributed to the efficient harvesting of triplet excitons by both the guest and host materials.
收录类别	SCI ; EI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55183
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zheng, X. J.,Q. M. Peng,J. Lin,et al. Simultaneous harvesting of triplet excitons in OLEDs by both guest and host materials with an intramolecular charge-transfer feature via triplet-triplet annihilation[J]. Journal of Materials Chemistry C,2015,3(27):6970-6978.
APA	Zheng, X. J..,Q. M. Peng.,J. Lin.,Y. Wang.,J. Zhou.,...&X. M. Pu and Z. Y. Lu.(2015).Simultaneous harvesting of triplet excitons in OLEDs by both guest and host materials with an intramolecular charge-transfer feature via triplet-triplet annihilation.Journal of Materials Chemistry C,3(27),6970-6978.
MLA	Zheng, X. J.,et al."Simultaneous harvesting of triplet excitons in OLEDs by both guest and host materials with an intramolecular charge-transfer feature via triplet-triplet annihilation".Journal of Materials Chemistry C 3.27(2015):6970-6978.

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