Transparent white organic light emitting diodes with improved cathode transparency

Jeong-Ik Lee; Jonghee Lee; Joowon Lee; Jae-Heon Shin; Chi-Sun Hwang; Hye Yong Chu

doi:10.1117/12.826573

27 August 2009 Transparent white organic light emitting diodes with improved cathode transparency

Jeong-Ik Lee, Jonghee Lee, Joowon Lee, Jae-Heon Shin, Chi-Sun Hwang, Hye Yong Chu

Proceedings Volume 7415, Organic Light Emitting Materials and Devices XIII; 74150Y (2009) https://doi.org/10.1117/12.826573
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

Abstract

We have fabricated transparent white organic light emitting diode (WOLED) for lighting application based on a hybrid white OLED and a phosphorescence white OLED. For the hybrid WOLED, a blue fluorescence emitting layer (FLEML) and green and red phosphorescence emitting layers (PH-EMLs) have been used in the device structure of ITO/hole transporting layer (HTL)/PH-EMLs/interlayer/FL-EML/ETL/LiF/Al. The balanced emissions from the FLEML and the PH-EMLs have been obtained by using appropriate carrier (hole) trapping effects in the PH-EMLs, which resulted in external and power efficiencies of 15 % and 27 lm/W, respectively, at a luminance of 1000 cd/m² without any out-coupling enhancement. The Commission Internationale de L'Eclairage (CIE) coordinates of this hybrid WOLED is (0.43,0.44) with color rendering index (CRI) of 80 and correlated color temperature (CCT) of 3200 K, respectively, in the bottom emission structure. Based on this hybrid WOLED, we established highly efficient transparent WOLED by introduction of a transparent cathode, and obtained over 19 lm/W of power efficiency at a total luminance of 1000 cd/m² as well as over 60 % of transmittance at 550 nm with the conventional glass encapsulation. Moreover, when the phosphorescent white OLED was combined with a transparent cathode, the power efficiency was reached up to 24 lm/W of power efficiency at a total luminance of 1000 cd/m².

Citation Download Citation

Jeong-Ik Lee, Jonghee Lee, Joowon Lee, Jae-Heon Shin, Chi-Sun Hwang, and Hye Yong Chu "Transparent white organic light emitting diodes with improved cathode transparency", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74150Y (27 August 2009); https://doi.org/10.1117/12.826573

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