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Efficient multiple triplet quantum well structures in organic light-emitting devices

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6 Author(s)
Park, Tae Jin ; Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Republic of Korea ; Jeon, Woo Sik ; Woo Choi, Jin ; Pode, Ramchandra
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We demonstrate the multiple quantum well (MQW) structures with the charge control layers (CCLs) to produce highly efficient red phosphorescent organic light-emitting devices (OLEDs). Various triplet quantum well devices from a single to five quantum wells are realized using wide band-gap hole and electron transporting layers, narrow band-gap host and dopant materials, and CCLs. Triplet energies in such MQW devices are confined at the emitting layers. The maximum external quantum efficiency of 14.8% with a two quantum well device structure is obtained. The described MQW device concept has been proposed to be very useful to future OLED display and lighting applications.

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Applied Physics Letters  (Volume:95 ,  Issue: 10 )