High Efficiency Fluorescent/Phosphorescent Hybrid White Organic Light-Emitting Diodes Without Spacer Structure

doi:10.11944/j.issn.1000-0518.2015.10.150186

Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (10): 1139-1145.DOI: 10.11944/j.issn.1000-0518.2015.10.150186

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High Efficiency Fluorescent/Phosphorescent Hybrid White Organic Light-Emitting Diodes Without Spacer Structure

DAI Yanfeng^a^b,ZHANG Zhiqiang^a,LIU Yipeng^a,MA Dongge^a^*()

^aChangchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
^bUniversity of Chinese Academy of Sciences,Beijing 100049,China

Received:2015-06-02 Accepted:2015-08-24 Published:2015-10-10 Online:2015-10-10
Contact: MA Dongge
Supported by:
Supported by the National Natural Science Foundation of China(No.51333007, No.91433201)

Abstract

Abstract:

In this paper, we fabricated high efficiency fluorescen/phosphorescent hybrid white organic light-emitting diodes with phosphorescent red, fluorescent blue and phosphorescent green three emitters without spacer. We used bis[N-(1-napthyl)-N-phenyl-amino] tetraphenyl(4P-NPD) as the fluorescent blue emitter due to its high fluorescence quantum yield(PLQY), the commonly used Ir(MDQ)₂(acac)[MDQ:2-methyl-dibenzo[f,h]quinoxaline, acac:acetylacetonate] and Ir(ppy)₃(acac)[ppy:2-phenylpyridine] were selected as the phosphorescent red and green dopants, respectively. We fabricated the corresponding emitting-layers by blending and doping methods to realize the highly efficient utilization in emitting layers and white light emission. The max current efficiency and power efficiency reach 27.1 cd/A and 30.3 lm/W, respectively. At the driving voltage of 6 V, the device can give off white light with the Commission Internationale de L'Eclairage(CIE)(0.33,0.41), Colour rendering index(CRI) of 70 and Correlated colour temperature(CCT) of 5432 K. On the basis of above structure, we also fabricated hybrid white organic light-emitting diodes with high CCT, which reaches 7106 K.

Key words: spacer, fluorescent/phosphorescent hybrid, white organic light-emitting diodes

DAI Yanfeng,ZHANG Zhiqiang,LIU Yipeng,MA Dongge. High Efficiency Fluorescent/Phosphorescent Hybrid White Organic Light-Emitting Diodes Without Spacer Structure[J]. Chinese Journal of Applied Chemistry, 2015, 32(10): 1139-1145.

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High Efficiency Fluorescent/Phosphorescent Hybrid White Organic Light-Emitting Diodes Without Spacer Structure

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