Abstract
High color rendering index (CRI) of 97 and wide correlated-color temperatures (CCTs) range of 2100-7600 K in white light-emitting diodes (WLEDs) employing the two-inch diameter of CaAlSiN <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> : Eu <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> (red phosphor) and Lu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">12</sub> : Ce <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> (green phosphor) co-doped phosphor-in-glass (PiG) are demonstrated by a novel wet-type cold isostatic pressing (CIP) technique. The wet-type CIP enable to apply isostatic pressure to a powder sample in all directions to obtain the PiG with excellent optical properties, high reliability, and thermal stability. The high CRI of 97 and the wide CCTs range of 2100-7600 K achieved are mainly due to the optimized phosphor materials and the precise adjustment thickness of the PiG. Based on the best formula of two-inch diameter PiG and a unique process of wet-type CIP, we have successfully fabricated and demonstrated the good uniformity and excellent performances of a large diameter of two-inch PiG. The proposed of a large diameter of two-inch PiG with excellent performance, high reliability, and thermal stability is essential to meet the economic dimension requirement for commercial usages in high-quality WLEDs indoor lighting applications.
Highlights
Color plays as an important role in the daily life of human culture
We studied to demonstrate the high color rendering index (CRI) of 97 and the wide correlated-color temperatures (CCTs) range of 2100–7600 K in the PiG-based white light-emitting diodes (WLEDs) by using four various golden formulas based on only one combination of CaAlSiN3: Eu2+ and Lu3Al5O12: Ce3+
The proposed of a large diameter of 2-inch PiG with excellent performance, high reliability, and thermal stability is essential to meet the economic dimension requirement for commercial usages in high-quality WLEDs indoor lighting applications
Summary
As the rapid growth of the solid-state lighting industry, the requirement for the variety and fidelity of the color performance is more than before, especially focusing on the characteristics of color rendering index (CRI) and correlated-color temperature (CCT) [1], [2]. Many studies have shown that the effects of artificial lighting on human health and the characteristics of the light may influence human physiology and psychology [3], [4]. The CCT of the warm white light is lower than 3300 K, which can give people a comfortable feeling and suitable for houses and dormitories. The CCT of the neutral white light is between 3300 and 5300 K. Due to the soft light, neutral white light is pleasant, comfortable, quiet, and suitable for many places, such as hospitals and restaurants.
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