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Such growth is likely to continue as LED-powered UV curing spreads across ink, adhesive and coating industries, forecasts the market research firm.
But this is only if we take into account standard applications, where UV LEDs replace UV lamps.
These firms were mostly small and medium enterprises (SMEs), but recently some big companies from the visible LED industry a€“ namely Philips Lumileds and LG Innotek a€“ have also secured a foothold in the UV LED business.
The entry of these two giants will help to further develop the industry, the market and the technology based on their strong experience of the visible LED industry, reckons Yole.
With the external quantum efficiency (EQE) of UV LEDs ranging from a few percent in UVC LEDs to 40-50% in UVA and near-UV LEDs, R&D directed at efficient chip manufacturing will be key for the development of UV LED markets, says Yole. To increase EQE, manufacturers need to develop techniques for each efficiency parameter: internal quantum efficiency, electron injection efficiency and light extraction efficiency.

Approaches such as flip-chip and photonic structures can be taken directly from the visible LED industry and its decade-plus of experience. In addition to the low power output of UV LEDs, their low efficiency creates additional difficulties at the packaging level.
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Advanced oxidation processes (AOP) include chemical procedures designed to remove organic and some inorganic materials in water and waste water by means of oxidation. AOP are attractive due to the use of relatively cheap and readily available chemicals, materials, and ease of operation. Your ProgressiveMedia filter not only keeps the dust down in your home, it keeps dust and dirt off HVAC component parts optimizing heat transfer. The potential is even greater if we consider the ability of UV LEDs to enable new concepts in areas like general lighting, horticultural lighting, biomedical devices, and in fighting hospital-acquired infections (HAIs). Since then, more than 50 firms have entered the field, over 30 of these between 2012 and 2014, mostly attracted by the high margin when overcapacity and strong price pressure from the 'LED TV crisis' had taken its toll on the visible LED industry.
A good example of this is that they have made a nearly full transition of their process to 6" sapphire substrates. With most of the input power being transformed into heat, thermal management represents a key topic for reliability in devices and associated systems.

In the treatment of water and waste water AOP employ ozone, hydrogen peroxide and ultraviolet light (UV).
Ultravation’s T3 (Thermal Transfer Technology) UV lamp utilizes a quartz glass sleeve that encases the UV lamp, protecting it from the passing cold air in an HVAC system. The UV LED business is therefore expected to grow from $90m in 2014 to about $520m in 2019. Compared to a process based on 2" substrates, this can provide an overall productivity increase of at least 30%, which would help to further reduce manufacturing cost. Here too, expertise developed in the visible LED industry will help to accelerate UV LED development, concludes Yole.
Hydroxyl (-OH) radicals may be generated by various methods inter alia radiation, chemical, sono- and photo-chemical methods. This creates more UV output— up to 50% more germ and mold killing power – without using any additional energy, simply because it keeps the lamp at a more favorable operating temperature. While the new applications do not yet have a strong impact on market size, Yole expects them to possibly count for nearly 10% of the total UV LED market by 2019.

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