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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41427

Title: Efficient carrier- and exciton-confining device structure that enhances blue PhOLED efficiency and reduces efficiency roll-off
Authors: Wen-Yi Hung
Zhong-Wen Chen
Hong-Wei You
Fu-Chuan Fan
Hsiao-Fan Chen
Ken-Tsung Wong
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: Charge mobility
Phosphorescent OLEDs
Device structure
Time-of-flight
Date: 2011
Issue Date: 2017-02-15T08:34:23Z
Publisher: Organic Electronics
Abstract: Abstract: In this study we used a known host material diphenylbis[4-(9-carbazoyl)phenyl]silane (SiCa) to realize a highly efficient bis[4,6-(difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic)–based blue phosphorescent device exhibiting high efficiencies of up to 18.3%, 41.5 cd/A, and 31 lm/W in a carrier- and exciton-confined device structure. At a practical brightness of 1000 cd/m2, the device performance (ηext) remained as high as 16.7%. The enhanced efficiency and reduced roll-off resulted mainly from the introduction of (a) DTAF as an HTL that efficiently blocked and confined excitons within the FIrpic-doped emissive layer, and (b) a thin layer of DPPS between the EML and TAZ, serving as an exciton- and hole-blocking layer to suppress exciton quenching by FIrpic at the EML–ETL interface. In addition, we incorporated a red phosphorescent dopant (Mpq2Iracac) into the blue device to fabricate a white phosphorescent organic light-emitting device, which exhibited satisfactory efficiencies (11.6%, 21.2 cd/A, 14.2 lm/W) with the Commission Internationale de L’éclairage (CIE) coordinates of (0.35, 0.38).
Relation: 12(4)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41427
Appears in Collections:[光電科學研究所] 期刊論文

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