Latest Science and Technology Comprehensibly Presented at LpS 2017

While all LpS 2017 sessions contained very interesting topics and highly qualified speakers, some found still outstanding interest and popularity.

Ki-Bum Nam, Seoul Semiconductor
One of the top runners in regards to attendance was Ki-Bum Nam. Seoul Semiconductor’s CTO gave at first a company overview and then went through the different technologies that will drive the company’s future. Some of the presented slides were especially remarkable, showing that LED manufacturers are looking far beyond their original core technology, growing semiconductors. While Dr. Nam sees the LED efficacy still growing, he emphasizes the great potential in respect to the ecosystem by limiting the power factor, which he identified to being still an issue in many products. Another big point for customer satisfaction is quality and reliability. CSP, namely SSC’s completely substrate-less WICOP has in his eyes big advantages on both fields. The simplification and reduction to the necessary elements promise higher reliability. In addition, this concept offers better homogeneity over the emission angle than packaged LEDs. Supposedly crucial for the popularity of this lecture was the fact to learn more directly from the CTO about the recently introduced jointly with Toshiba Materials developed of SSC TRI-R technology based SunLike product series. While the concept basically was already shown from Toshiba Materials at Light + Building 2016, it has been further improved by using SSC’s purple/UV chip. This technology currently outperforms the other approaches in any color metrics. Furthermore, the company claims that it satisfies the often postulated requirements for health and well-being because of the better match with biological functions of the sun-like spectral distribution that also should reduce glare and increase good visibility. At the end of his lecture Dr. Nam identified four key-challenges for the future that also give an idea about SSC’s technology roadmap: Efficiency droop that could be solved by the company’s proprietary nPola technology; achieving 240 lm/W by 2020 in standard products; improving efficacy over 150 lm/W for LEDs with high color quality like the SunLike; and the miniaturization of drivers with over 24 W, very likely to extend the Nano Driver series.

Dr. Ken T. Shimizu, Lumileds
Another remarkable lecture was held during the same session by Dr. Ken T. Shimizu, Lumileds’ Novel Technologies and Devices, Research and Development Director. Lumileds is intensely researching and working on QD LEDs hoping to beat two at one blow, efficiency and light quality. In their current prototypes, they relied on QDs with a reduced amount of Cd that lies far beyond all limits, but as they are committed to environmental friendly manufacturing and products, they hope to be able to replace them step by step. According to Dr. Shimizu, the main advantage of the used colloidal quantum dots (QDs) is their accurate color tuneability in combination with their narrow bandwidth. This is especially important in the red spectrum range of white LEDs. While today’s QDs are basically a little bit less efficient than conventional phosphors, the narrow bandwidth allows tuning the white light to very high CRI respectively TM-30 without emitting too much light in a spectral range that does not contribute to the visible light quality, namely deep red to near infrared. This leads to a higher system efficacy than pure phosphor converted high CRI LEDs can provide. The presented results are also quite promising in regards to reliability and longevity.

Pars Mukish, Yole Développement
For all who were interested in learning what is coming next, the presentation from Pars Mukish, Senior Market and Technology Analyst at Yole Développement was a must. His sound understanding of both market and technology makes his lectures unique. He explains why the time to make the big bucks with conventional LEDs for lighting is almost over. For LED manufacturers, the future is in application diversification or product diversification. The first is especially automotive where further growth can be expected because of the roll-out of the technologies from luxury cars to the premium segment and finally to the medium segment to become the standard. However, the manufacturers must then consider to producing OLEDs and lasers. Product diversification means to develop UV or IR LEDs for various applications, but also micro-LEDs for display applications. Especially these three technologies are developing fast with huge progress in the last years.

Prof. Dr. Fred C. Lee, Virginia Tech University
From the technical point of view, one highlight was the contribution of Prof. Dr. Fred C. Lee from the Virginia Tech University entitled “GaN Based High Frequency Power Supply with Integrated Magnetics”. While the example was based on a true high power application, a 1 kW server power supply, the approach gives an idea what this could mean for LED lighting. Using a high frequency design is not new and a logical step for system miniaturization, but usually on the cost of efficiency. GaN power devices are one key element to compensate this disadvantage. But it is by far not the only measure. Intelligent product design utilizing the advantages of different technologies as presented leads to unexpected efficiency in a tiny package. Two of these technologies are zero-voltage switching and transformer structures with shielding embedded in a multi-layer PCB. Another concern in regards to high switching frequencies, EMI, can be reduced below the critical threshold with some simple measures.

The highly popular LpS conference program is known for its high quality and comprehensive lectures. The 2017 program received enthusiastic feedback with a total of 74% of attendees rating it from very good to excellent. It is our aim to continue to improve this standard at the LpS 2018 and to live up to the expectations of our conference attendees, the industry and research sectors as a whole.

Call for Papers for LpS 2018
You can help us with that by sharing your professional knowledge in a lecture at the LpS 2018.
Take this opportunity to present your research, developments, innovations and expectations for future technologies to a highly qualified audience.
Submit your abstract by February 16th 2018.

We look forward to receiving many interesting submissions!