In this study we have synthesized ZnO:EuCl3 phosphors under various sintering atmospheres and temperatures, and investigated the effect of coupling structure of Eu in ZnO upon the photoluminescent characteristics for the purpose of searching for optimum conditions towards pure red emission. The analysis of x-ray diffraction and photoluminescence spectra measurements indicate that, for ZnO:EuCl3 phosphors sintered in vacuum, Eu exists in the host lattice as EuOCl and effectively quenches the broad-band emission of the ZnO host, consequently isolating the red emission due to Eu3+ ion.

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The inline manufacturing equipment using a combination of the belt source and LPS source which is innovatively designed is introduced for the large-size AMOLED. The features of the inline system include 60sec TACT time, 19 numbers of chambers, non-substrate bending and easy application to very thin TFT substrates for the 4P th P -8P th P Generation AMOLEDs.

We developed a hybrid encapsulation method for PM‐OLED consisting of SiNx, polymeric film and cover glass. The PM‐OLED encapsulated with the proposed layers shows the similar degradation in emission efficiency with the PM‐OLED with a metal cap. The proposed structure does not need to have desiccant inside so that thin‐film encapsulation of PM‐OLED is possible.

New TPS(Temperature Programmed Sublimation) technology has been developed in order to deploy to the belt source evaporation for large-size AMOLED deposition processes. When the organic film deposit on the metal plate, we have found it has nano-scale film phase and bulk phase for the first time. The film phase of the Alq3 has 2,000Å for its saturated thickness and 155℃ for its sublimation temperature. Also, there are no particles generated during plane source sublimation and TPS function as a powerful tool provides optimum thickness information for the AMOLED deposition processes.SID 07 DIGEST • 385 ISSN/007-0966X/07/3801-0385-$1.00 © 2007 SID

Full color 2.2‐inch Quarter Common Intermediate Format (QCIF) organic EL displays were developed using phosphorescent materials and low temperature poly‐Si (LTPS) technology. These displays exhibited a world record efficiency of 11cd/A at an optimized white CIE coordinate of (0.31, 0.32) with an OLED operating voltage of 6V. The current pixel structure for the 2.2‐inch display allows about 32% aperture ratios and a white peak luminance of over 300cd/m2.

We studied emission characteristics of blue fluorescent multi-tandem OLEDs using Al/MoO x as charge generation layer(CGL). Threshold voltage for 2, 3, 4, and 5 units tandem OLEDs was 8, 11, 14 and 18 V, respectively. The threshold voltage in multi-tandem OLEDs was lower than multiple of 4 V for the single OLED. Maximum current efficiency and maximum quantum efficiency of single OLED were 7.6 cd/A and 5.5%. Maximum current efficiency for 2, 3, 4, and 5 units tandem OLEDs was 22.6, 31.4, 41.2, and 46.6 cd/A, respectively. Maximum quantum efficiency for 2, 3, 4, and 5 units tandem OLEDs was 11.8, 15.8, 21.8, and 25.6%, respectively. The maximum current efficiency and maximum quantum efficiency in multi-tandem OLEDs were higher than multiple of those for the single OLED. The intensity for 508 nm peak was changed and the peak wavelength was red shift by increase of tandem unit in electroluminescent emission spectra. These phenomena can be caused by micro-cavity effect with increasing of organic layer thickness.

To study the encapsulation method for heat dissipation of high brightness organic light emitting diode (OLED), red emitting OLED of ITO (150 ㎚) / 2-TNATA (50 ㎚) / NPB (30 ㎚) / Alq3 : 1 vol.% Rubrene (30 ㎚) / Alq3 (30 ㎚) / LiF (0.7 ㎚) / Al (200 ㎚) structure was fabricated, which on Alq3 (150 ㎚) / LiF (150 ㎚) as buffer layer and Al as protective layer was deposited to protect the damage of OLED, and subsequently it was encapsulated using attaching film and metal sheet. The current density, luminance and power efficiency was improved according to thickness of Al protective layer. The emission spectrum and the Commission International de L'Eclairage (CIE) coordinate did not have any effects on encapsulation process using attaching film and metal sheet The lifetime of encapsulated OLED using attaching film and metal sheet was 307 hours in 1,200 ㎚ Al thickness, which was increased according to thickness of Al protective layer, and was improved 7% compared with 287 hours, lifetime of encapsulated OLED using attaching film and flat glass. As a result, it showed the improved current density, luminance, power efficiency and the long lifetime, because the encapsulation method using attaching film and metal sheet could radiate the heat on OLED effectively.