Mn4+activated Al2O3red-emitting ceramic phosphor with excellent thermal conductivity

Tian, Cuicui; Lin, Hui; Zhang, Dawei; Zhang, Peiping; Hong, Richang; Han, Zhaoxia; Qian, Xinglu; Zou, Jun

doi:10.1364/oe.27.032666

Cited by 35 publications

(36 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the problem arose when the microscopic molecule bounded to a structure cannot radiate under uniform distribution or when the discrepancy between the molecule and emission frequency is large. The report of Gu et al claimed that submerging method on InGaN quantum wells (QWs) of lighting device when deploying the 520 nm TiO2 increased the light output by 85% [10]. TiO2 and GaN are also compatible in terms of refractive index and translucent domain.…”

Section: Introductionmentioning

confidence: 99%

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Thi

Loan

Bui

et al. 2021

IJECE

View full text Add to dashboard Cite

The white light-emitting diode (WLED) has been the most advance lighting method currently, however, the fabrication process of this configuration still has drawbacks which negatively affect its color quality. This research was conducted to provide a method for WLED’s lighting output enhancement. Since CaCO3 particles are excellent for thermal stability enhancement, especially when being combined with an adhesive substance, we decided to integrate CO3 particles into resin matrix such as melamine formaldehyde (MF) and investigate their influences on the optical properties, including color uniformity and lumen output, of the WLED. The results showed that CaCO3 and MF resin are beneficial to the light scattering efficiency, which results in higher luminous flux and chromatic quality for WLED packages. In addition to that, the appropriate amounts of MF resin and CaCO3 for reaching the best lumen efficiency and color quality are figured out at 1% and 10%, respectively. Moreover, another advantage of using MF resin and CaCO3 for fabricating WLEDs is cost effectiveness. Hence, it has turned out that CaCO3 and MF resins can be potential materials for next high-quality WLED generations.

show abstract

Section: Introductionmentioning

confidence: 99%

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Thi

Loan

Bui

et al. 2021

IJECE

View full text Add to dashboard Cite

show abstract

“…Specifically, the emitted light will become more bluish as it reaches the surface of LED, while it tends to be more yellowish when it is almost parallel to the surface of the LED. Thus, if the distribution of the light intensity changes, it can result in a yellow circle surrounding the white light, which is also known as yellow ring phenomenon [9][10][11][12]. When the white light quality and lumen output receive the optimized methods for phosphorus or optical structure of white LEDs, there will be a positive difference.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of luminous flux and color quality of white light-emitting diodes by using green (Y,Gd)BO3:Tb3+ phosphor

2021

View full text Add to dashboard Cite

In the study, we analyzed and clarified the effect of green (Y,Gd)BO3:Tb 3+ phosphor on chromatic homogeneity and optical performance of multi-chip white LEDs (MCW-LED). Thereby there is a solution to get the best luminous efficiency. In addition, (Y,Gd)BO3:Tb 3+ is known as one of the factors that has a significant impact on lighting performance, so it needs to add the (Y,Gd)BO3:Tb 3+ phosphor in the structure of LEDs to combine with the yellow phosphor YAG:Ce 3+ to receive the best results. Therefore, the concentration and size of (Y,Gd)BO3:Tb 3+ should be choose carefully so that the presentation of MCW-LEDs would be more incredible. The results show that when the concentration of green-emitting (Y,Gd)BO3:Tb 3+ phosphor tends to increase, it also helps the color homogeneity and the lumen efficiency of MCW-LEDs with the average correlated color temperature (CCT) of 5600 K-8500 K become better.

show abstract

“…As seen, phosphor-converted white light-emitting diodes (WLEDs) is a fourth-generation source of illumination and a potential for replacing the conventional one that has a variety of prospects in lighting solution [1]. The application of white light-emitting diodes has spread to many different fields of our life, for example, lighting equipment for landscape and street, or backlighting.…”

Section: Introductionmentioning

confidence: 99%

Study of red-emitting LaAsO4:Eu3+ phosphor for color rendering index improvement of WLEDs with dual-layer remote phosphor geometry

2020

View full text Add to dashboard Cite

The remote phosphor structure is often disadvantageous in color quality but in terms of optics it is more convenient when compared to other phosphor structures such as conformal or in-cup ones. From this disadvantage, there are many studies to improve its chromatic output. In this research paper, we propose a dual-layer remote phosphor geometry for the improvement of white light-emitting diodes (WLEDs) in two parameters: color rendering index (CRI) and color quality scale (CQS). The 7700 K WLEDs are used in this study. The idea of the study is to place a red phosphor layer LaAsO4:Eu 3+ on the yellow phosphor YAG: Ce 3+ , and then find the concentration of LaAsO4:Eu 3+ in an appropriate way to achieve the highest color quality. The results showed that LaAsO4:Eu 3+ bring great benefits for enhancing CRI and CQS. In particular, the greater the concentration of LaAsO4:Eu 3+ , the greater the CRI and CQS because the portion of red lights in WLEDs increases. However, the decrease in lumen output occurs when the concentration of LaAsO4:Eu 3+ increases excessively. This is proved thanks to Mie-scattering theory and Beer-Lambert law. The results of important articles in WLEDs fabrication have greatly contributed to a higher white light quality

show abstract

Mn⁴⁺activated Al₂O₃red-emitting ceramic phosphor with excellent thermal conductivity

Cited by 35 publications

References 35 publications

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Enhancement of luminous flux and color quality of white light-emitting diodes by using green (Y,Gd)BO3:Tb3+ phosphor

Study of red-emitting LaAsO4:Eu3+ phosphor for color rendering index improvement of WLEDs with dual-layer remote phosphor geometry

Contact Info

Product

Resources

About