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Conference Chair Welcome Letter
The 3rd International Conference on Light-Emitting Devices
and Their Industrial Applications（
（LEDIA’15）
）
Tohru Honda
Steering Committee, Chair, LEDIA ‘15
Dean, School of Advanced Engineering,
Kogakuin University
It gives me great pleasure to welcome all of you to the 3rd International Conference on LightEmitting Devices and Their Industrial Applications (LEDIA '15) as a part of the 4th Optics and
Photonics International Congress (OPIC2015).
First, I sincerely congratulate Professors Isamu Akasaki, Hiroshi Amano (Conference chair,
LEDIA ’15), and Shuji Nakamura on their being awarded the 2014 Nobel Prize in Physics for “the
invention of efficient blue light-emitting diodes, which has enabled bright and energy-saving white
light sources”. Their discovery and development of highly efficient blue LEDs and high-brilliance
white light sources will be a base of our discussions in LEDIA ’15. The session will be started from
Prof. Amano’s lecture. Please enjoy discussions concerning with light-emitting devices and their
industrial applications.
Apart from the conference activities, I would like you to have a chance to enjoy some of the famous
tourist attractions in Yokohama or relax and recharge yourself. Please enjoy a Japanese spring season.
Finally, I welcome you once again to LEDIA ’15. I hope all of participants gain successful
achievement in this conference.
[LEDIA'15]
1) Technology trend
The Nobel Prize in Physics 2014 has directed the spotlight on the light-emitting diodes.
According to Japanese Cabinet Office, LED illuminations now cover close to 30% of the entire
illuminations, and 100% coverage is targeted by 2020. Such facts have accelerated further
expectations from LEDs. Not just high power LEDs towards illuminations but also entirely new
applications using LEDs in other fields are largely expected. Recently laser illuminations have
been proposed, and novel low-cost fabrication technologies for light emitting devices have been
reported. Furthermore light-emitting devices covering unrealized wavelength regions have been
fabricated. Under the circumstances, LEDIA'15 has decided to expand its own scope covering
not just LED but also more advanced light emitting devices, providing an opportunity to have
stimulating discussions for the light-emitting devices and their industrial applications.
2) Topics
LEDIA'15 provides three main topics, "laser diode and its applications", "LED and its
applications", and "deep ultraviolet light-emitting devices". Firstly a joint session with LDC has
been organized, in which Dr. Steegmueller from OSRAM Semiconductor and Dr. Watanabe
from Philips Lumileds Lighting present the state-of-the-art laser diodes and LEDs and their
illumination applications. Dr. Ikeda from Pi Photonics also introduces highly directional novel
illuminations. On the other hand in ordinarily sessions, Dr. Wierer from Sandia National
Laboratories talks about prospects of laser lighting, and Prof. Perlin reports high power blue
laser diode array for various applications. Regarding the LEDs, Dr. Ohta from Toyoda Gosei
tutors history and progress of GaN LEDs, and Prof. Fujioka mentions a novel fabrication
method for low-cost and high-performance LEDs. Finally Prof. Sitar from North Carolina State
University and Dr. Hirano from UV Craftory plan to talk about deep ultraviolet light-emitting
devices for sterilization and purification.
3) Outputs
As the name indicates, LEDIA focuses not only light-emitting devices but also their
applications. There are many international conferences on light-emitting devices, but very few
conference covers their applications. In LEDIA, researchers and engineers from both the fields
gather in the same room and discuss issues and solutions for the industrial applications, which is
the most distinctive aspect of LEDIA. Therefore LEDIA promotes rapid progresses of the
application technologies of the light-emitting devices, resulting in developments in the related
industrial fields and contributions to the quality of life in the world.