Emitters For OLEDs Research Articles

Evaluation of luminances and yields for red, green, and blue organic light emitting diodes

For red, green and blue OLEDs that emit for each of them in a wide spectral range ( nm), we calculate the luminous luminance, the energetic luminance and the various yields in the pseudo-monochromatic hypothesis (ideal source generally considered), and we compare with a calculation in relation with a polychromatic system (real source). Finally, we demonstrate that the values of the energetic luminance and of the energetic or quantum yield are practically unchanged whatever the hypothesis; on the contrary, in the simplified case of the pseudo-monochromatic source, the luminous luminance and the luminous yield of a green organic diode are overvalued in relation to the polychromatic real case, whereas for a blue or a red organic diode these parameters (calculated in the pseudo-monochromatic hypothesis) are undervalued. The error is all the more great since the OLED emission is far away from the maximum value of the photoptical eye response.

49.4: Two TFT Pixel Circuit with Non-Uniformity Suppress-Function for Voltage Programming Active Matrix OLED Displays

We proposed the world's first two TFT pixel circuit with an inter-pixel non-uniformity suppress-function for the analog voltage programming to assist in the realization of small pixel bottom emission OLED displays. The pixel circuit provides larger OLED fill factor. We fabricated a 2.5 inch 240 (V) × 960 (H) pixel monochrome bottom emission display.

49.1: A 14.1 inch Full Color AMOLED Display with Top Emission Structure and a-Si TFT Backplane

A structure and a design of device were developed to fabricate large-scale active matrix organic light-emitting diode (AMOLED) display with good color purity and high aperture ratio. With these technologies, we developed a full color 14.1 inch WXGA AMOLED display. For the integration of OLED on an active matrix a-Si TFT backplane, an efficient top emission OLED is essential since the TFT circuitry covers a large position of the pixel aperture. These technologies will enable up the OLED applications to larger size displays such as desktop monitors and TVs.

P‐46: New Color Changing Materials for OLED Microdisplays

AbstractVacuum‐deposited and spin‐coated color changing media (CCM) films for use in color microdisplays with blue OLED emitters have been demonstrated with optical density 5.0 and 2.8 per micron at the maximum of absorption, respectively. CCM efficiency has been studied as a function of film thickness, dopant concentration and excitation wavelength.