Osram Opto Semiconductors Gmbh

Pacific Light Technologies Corp.

Nathan Mclaughlin

Michael Jansen

Jason King

Kari N Haley

Weiwen Zhao

Brian Theobald

Norbert Puetz

Morgan Vonnahme

A method of increasing photo-luminescent quantum yield (PLQY) of QDs to be used as down-converters placed directly on an LED chip includes synthesizing a plurality of quantum dots, applying energy to the plurality of quantum dots to increase PLQY of the plurality of quantum dots, dispensing the plurality of quantum dots onto the LED chip, and curing the LED chip.

Method and apparatus of applying light and heat to quantum dots to increase quantum yield

Photoluminescence quantum yield (PLQY) testing of quantum dots is described. In one embodiment, a method involves heating a sample including quantum dots and illuminating the sample with a light source. The method involves measuring spectra of luminescence from the illuminated quantum dots of the sample at each of a plurality of temperatures. The method involves measuring each of the plurality of temperatures with a temperature sensor. The PLQY at each of the plurality of temperatures is computed based on the measured spectra. The method further involves computing a relationship between QD emission wavelength of the measured spectra and the plurality of temperatures measured with the temperature sensor. The relationship is used to determine the QD temperature corresponding to each of the PLQY computations. In one embodiment, an integrating sphere moves on a gantry over the samples.

Photoluminescence quantum yield (PLQY) test of quantum dot (QD) films

Growing community of inventors

Portland, OR, United States of America

Nathan Mclaughlin