JP2018060842A

JP2018060842A - Light-emitting device

Info

Publication number: JP2018060842A
Application number: JP2016195269A
Authority: JP
Inventors: 篤史板東; Atsushi Bando
Original assignee: Nichia Chemical Industries Ltd
Current assignee: Nichia Chemical Industries Ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2018-04-12
Anticipated expiration: 2036-09-30
Also published as: JP6834316B2

Abstract

PROBLEM TO BE SOLVED: To extract light of brightness meeting an application of a light-emitting device concerned, provided that the light-emitting device has a first light-emitting element part as a main light source, and a second light-emitting element part as a subsidiary light source.SOLUTION: A light-emitting device comprises: a base; a first light-emitting element part disposed on the base and including at least one first light-emitting element having a light emission peak wavelength in a wavelength region of 420 nm or higher and lower than 480 nm; a second light-emitting element part including at least one second light-emitting element having a light emission peak wavelength in a wavelength region of 480 to 530 nm, disposed on the base, and connected in parallel to the first light-emitting element part; and a translucent member including a phosphor of which the efficiency of excitation by light from the first light-emitting element is higher than an efficiency of excitation by light from the second light-emitting element. The first light-emitting element part is higher than the second light-emitting element part in intensity of light emission.SELECTED DRAWING: Figure 1A

Description

本開示は発光装置に関する。 The present disclosure relates to a light emitting device.

複数の発光素子が並列に接続されてなる発光装置が提案されている（特許文献１、２参照）。 A light emitting device in which a plurality of light emitting elements are connected in parallel has been proposed (see Patent Documents 1 and 2).

特開２００９−７６６８４号公報JP 2009-76684 A 特開２０１１−２１６８９１号公報JP 2011-216891 A

しかしながら、照明用途などの発光装置は、所定の明るさを得るために用いられる主要光源としての発光素子と、演色性を高めるなどの目的で補助的に用いられる補助光源としての発光素子と、を有する場合がある。この場合、上記従来の発光装置では、主要光源としての発光素子に流す電流と、補助光源としての発光素子に流す電流と、の大きさを調整することが困難となる可能性がある。このため、補助光源としての発光素子を必要にして十分な発光強度で発光させつつ、主要光源としての発光素子を所望の発光強度で十分に発光させることができない可能性があり、ひいては、発光装置からその用途に見合った明るさの光を取り出すことができない可能性がある。 However, a light-emitting device for illumination use includes a light-emitting element as a main light source used to obtain a predetermined brightness, and a light-emitting element as an auxiliary light source that is used supplementarily for the purpose of enhancing color rendering. May have. In this case, in the conventional light emitting device, it may be difficult to adjust the magnitudes of the current flowing through the light emitting element as the main light source and the current flowing through the light emitting element as the auxiliary light source. For this reason, there is a possibility that the light emitting element as the auxiliary light source is required to emit light with sufficient light emission intensity, while the light emitting element as the main light source cannot be sufficiently emitted with desired light emission intensity. Therefore, it may not be possible to extract light with the brightness appropriate for the application.

上記の課題は例えば次の手段により解決することができる。基台と、４２０ｎｍ以上４８０ｎｍ未満の波長域に発光ピーク波長がある少なくとも１つの第１発光素子からなり、前記基台上に配置される第１発光素子部と、４８０ｎｍ以上５３０ｎｍ以下の波長域に発光ピーク波長がある少なくとも１つの第２発光素子からなり、前記基台上に配置され、前記第１発光素子部に対して並列に接続される第２発光素子部と、前記第１発光素子からの光による励起効率が前記第２発光素子からの光による励起効率よりも高い蛍光体を含む透光性部材と、を備え、前記第１発光素子部の発光強度は前記第２発光素子部の発光強度よりも高い発光装置。 The above problem can be solved by, for example, the following means. A base, and at least one first light emitting element having an emission peak wavelength in a wavelength range of 420 nm or more and less than 480 nm, and a first light emitting element portion disposed on the base and a wavelength range of 480 nm or more and 530 nm or less A second light emitting element having at least one second light emitting element having an emission peak wavelength, disposed on the base, and connected in parallel to the first light emitting element; and from the first light emitting element A translucent member containing a phosphor having an excitation efficiency by light of higher than that of light emitted from the second light emitting element, and the light emission intensity of the first light emitting element part is that of the second light emitting element part A light-emitting device with a higher emission intensity.

第１発光素子部を主要光源とし、第２発光素子部を補助光源とする発光装置において、発光装置からその用途に見合った明るさの光を取り出すことができる。 In a light-emitting device using the first light-emitting element portion as a main light source and the second light-emitting element portion as an auxiliary light source, it is possible to extract light with brightness suitable for the application from the light-emitting device.

実施形態１に係る発光装置の模式的平面図である。1 is a schematic plan view of a light emitting device according to Embodiment 1. FIG. 実施形態１に係る発光装置の回路図である。1 is a circuit diagram of a light emitting device according to Embodiment 1. FIG. 図１Ａ中の１Ｃ−１Ｃ断面図である。It is 1C-1C sectional drawing in FIG. 1A. 図１Ａ中の１Ｄ−１Ｄ断面図である。It is 1D-1D sectional drawing in FIG. 1A. 実施形態２に係る発光装置の模式的平面図である。6 is a schematic plan view of a light emitting device according to Embodiment 2. FIG. 実施形態２に係る発光装置の回路図である。6 is a circuit diagram of a light emitting device according to Embodiment 2. FIG. 実施形態３に係る発光装置の模式的平面図である。6 is a schematic plan view of a light emitting device according to Embodiment 3. FIG. 実施形態３に係る発光装置の回路図である。6 is a circuit diagram of a light emitting device according to Embodiment 3. FIG. 実施形態４に係る発光装置の模式的平面図である。6 is a schematic plan view of a light emitting device according to Embodiment 4. FIG. 実施形態４に係る発光装置の回路図である。6 is a circuit diagram of a light emitting device according to Embodiment 4. FIG. 実施形態５に係る発光装置の模式的平面図である。6 is a schematic plan view of a light emitting device according to Embodiment 5. FIG. 実施形態５に係る発光装置の回路図である。6 is a circuit diagram of a light emitting device according to Embodiment 5. FIG. 実施形態６に係る発光装置の模式的平面図である。7 is a schematic plan view of a light emitting device according to Embodiment 6. FIG. 実施形態６に係る発光装置の回路図である。10 is a circuit diagram of a light emitting device according to Embodiment 6. FIG.

［実施形態１に係る発光装置］
図１Ａは実施形態１に係る発光装置１の模式的平面図であり、図１Ｂは実施形態１に係る発光装置１の回路図であり、図１Ｃは図１Ａ中の１Ｃ−１Ｃ断面図であり、図１Ｄは図１Ａ中の１Ｄ−１Ｄ断面図である。図１Ａにおいては、透光性部材５０と蛍光体６０の図示を省略している。図１Ａから図１Ｄに示すように、実施形態１に係る発光装置１は、基台１０と、４２０ｎｍ以上４８０ｎｍ未満の波長域に発光ピーク波長がある少なくとも１つの第１発光素子２１からなり、基台１０上に配置される第１発光素子部と、４８０ｎｍ以上５３０ｎｍ以下の波長域に発光ピーク波長がある少なくとも１つの第２発光素子２２からなり、基台１０上に配置され、第１発光素子部に対して並列に接続される第２発光素子部と、第１発光素子２１からの光による励起効率が第２発光素子２２からの光による励起効率よりも高い蛍光体６０を含む透光性部材５０と、を備え、第１発光素子部の発光強度は第２発光素子部の発光強度よりも高い発光装置である。実施形態１に係る発光装置１では、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させる。そのため、発光装置１からその用途に見合った明るさの光を取り出すことができる。以下、詳細に説明する。 [Light Emitting Device According to Embodiment 1]
1A is a schematic plan view of the light-emitting device 1 according to Embodiment 1, FIG. 1B is a circuit diagram of the light-emitting device 1 according to Embodiment 1, and FIG. 1C is a cross-sectional view taken along 1C-1C in FIG. 1A. 1D is a 1D-1D cross-sectional view in FIG. 1A. In FIG. 1A, illustration of the translucent member 50 and the phosphor 60 is omitted. As shown in FIGS. 1A to 1D, the light-emitting device 1 according to Embodiment 1 includes a base 10 and at least one first light-emitting element 21 having an emission peak wavelength in a wavelength region of 420 nm or more and less than 480 nm. The first light-emitting element unit disposed on the base 10 and the at least one second light-emitting element 22 having a light emission peak wavelength in a wavelength range of 480 nm to 530 nm are disposed on the base 10 and A second light-emitting element connected in parallel to the light-emitting element, and a light-transmitting property including a phosphor 60 in which excitation efficiency by light from the first light-emitting element 21 is higher than excitation efficiency by light from the second light-emitting element 22 And a light emitting device having a light emission intensity of the first light emitting element portion higher than that of the second light emitting element portion. In the light emitting device 1 according to the first embodiment, the second light emitting element unit as the auxiliary light source is required to emit light with sufficient light emission intensity, while the first light emitting element unit as the main light source sufficiently emits light with the desired light emission intensity. Let Therefore, light with brightness suitable for the application can be extracted from the light emitting device 1. Details will be described below.

（基台１０）
基台１０には、例えば、母材上に配線を備えた絶縁性基板を用いることができるほか、本実施形態のように金属板１４が樹脂部１５に埋設された樹脂パッケージなどを用いることができる。絶縁性基板の母材には例えばセラミックなどを用いることができる。絶縁性基板の配線や樹脂パッケージの金属板１４は、後述する第１電極１１や第２電極１２またはこれらの電極の一部に相当し、例えば、鉄、銅、銀、コバール、ニッケルなどからなる。 (Base 10)
For the base 10, for example, an insulating substrate having wiring on a base material can be used, and a resin package in which the metal plate 14 is embedded in the resin portion 15 as in this embodiment is used. it can. For example, ceramic or the like can be used as the base material of the insulating substrate. The wiring of the insulating substrate and the metal plate 14 of the resin package correspond to the first electrode 11 and the second electrode 12 described later or a part of these electrodes, and are made of, for example, iron, copper, silver, kovar, nickel, or the like. .

基台１０は第１電極１１と第２電極１２とを有する。第１電極１１と第２電極１２は、第１発光素子部が第１ワイヤ３１を介して電気的に接続される領域に第１メッキ層１６を有し、第２発光素子部が第２ワイヤ３２を介して電気的に接続される領域に第２メッキ層１７を有することが好ましい。このようにすれば、第１メッキ層１６と第２メッキ層１７とを互いに導電率が異なるメッキ材料や互いに厚みが異なるメッキ材料などで構成することにより、第１発光素子部に流れる電流を第２発光素子部に流れる電流よりも大きくすることができる。したがって、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させることが容易になる。導電率が互いに異なる材料で構成される場合の一例としては、第１メッキ層１６のメッキ材料が銀であり、第２メッキ層１７のメッキ材料が金である場合を挙げることができる。 The base 10 has a first electrode 11 and a second electrode 12. The first electrode 11 and the second electrode 12 have a first plating layer 16 in a region where the first light emitting element portion is electrically connected via the first wire 31, and the second light emitting element portion is the second wire. It is preferable to have the second plating layer 17 in a region electrically connected via 32. According to this configuration, the first plating layer 16 and the second plating layer 17 are made of plating materials having different electrical conductivity or plating materials having different thicknesses, so that the current flowing through the first light emitting element portion is increased. It can be made larger than the current flowing through the two light emitting element portions. Therefore, it becomes easy to make the first light emitting element portion as the main light source sufficiently emit light with the desired light emission intensity while making the second light emitting element portion as the auxiliary light source emit light with sufficient light emission intensity. As an example of the case where the conductivity is made of materials different from each other, a case where the plating material of the first plating layer 16 is silver and the plating material of the second plating layer 17 is gold can be cited.

図１Ａにおいて、第１メッキ層１６及び第２メッキ層１７は、第１ワイヤ３１及び第２ワイヤ３２と第１電極１１及び第２電極１２とが接続される領域とその近傍のみに配置されている。このようにすれば、必要な部分にのみ第１メッキ層１６及び第２メッキ層１７が配置されるため、用いるメッキの量を抑制することができる。また、メッキを設ける領域が小さくなるため、第１メッキ層１６及び第２メッキ層１７が光反射率の低いメッキ材料からなる場合において、光取り出し効率の低下を抑制することができる。なお、第１メッキ層１６及び第２メッキ層１７は、第１電極１１及び第２電極１２の全面に第１メッキ層１６を設けた後、第２ワイヤ３２が接続される領域とその周囲にのみ第２メッキ層１７をスポット塗布することなどにより、平面視において第２ワイヤ３２が接続される領域とその周囲を除く全面に第１メッキ層１６が位置するよう配置されていてもよい。 In FIG. 1A, the first plating layer 16 and the second plating layer 17 are disposed only in the region where the first wire 31 and the second wire 32 are connected to the first electrode 11 and the second electrode 12 and in the vicinity thereof. Yes. In this way, since the first plating layer 16 and the second plating layer 17 are disposed only in necessary portions, the amount of plating to be used can be suppressed. Moreover, since the area | region which provides plating becomes small, when the 1st plating layer 16 and the 2nd plating layer 17 consist of a plating material with a low light reflectivity, the fall of light extraction efficiency can be suppressed. The first plating layer 16 and the second plating layer 17 are formed on and around the region where the second wire 32 is connected after the first plating layer 16 is provided on the entire surface of the first electrode 11 and the second electrode 12. Only by spot coating the second plating layer 17, the first plating layer 16 may be disposed on the entire surface excluding the region where the second wire 32 is connected and its periphery in a plan view.

基台１０は、第１電極１１や第２電極１２に加えて、放熱を目的とする部位を有していてもよい。 In addition to the 1st electrode 11 and the 2nd electrode 12, the base 10 may have the site | part aiming at heat dissipation.

（第１発光素子部、第２発光素子部）
第１発光素子部は少なくとも１つの第１発光素子２１からなり、第２発光素子部は少なくとも１つの第２発光素子２２からなる。換言すると、第１発光素子部は、本実施形態のように１つの第１発光素子２１から構成されていてもよいし、後述する他の実施形態のように複数の第１発光素子２１から構成されていてもよい。同様に、第２発光素子部は、本実施形態のように１つの第２発光素子２２から構成されていてもよいし、後述する他の実施形態のように複数の第２発光素子２２から構成されていてもよい。第１発光素子部が複数の第１発光素子２１からなる場合、複数の第１発光素子２１同士は、直列接続、並列接続又はこれらの組み合わせで互いに接続される。同様に、第２発光素子部が複数の第２発光素子２２からなる場合、複数の第２発光素子２２同士は、直列接続、並列接続又はこれらの組み合わせで互いに接続される。 (1st light emitting element part, 2nd light emitting element part)
The first light emitting element unit includes at least one first light emitting element 21, and the second light emitting element unit includes at least one second light emitting element 22. In other words, the first light emitting element unit may be configured by one first light emitting element 21 as in the present embodiment, or may be configured by a plurality of first light emitting elements 21 as in other embodiments described later. May be. Similarly, the second light emitting element unit may be configured by one second light emitting element 22 as in the present embodiment, or may be configured by a plurality of second light emitting elements 22 as in other embodiments described later. May be. When the 1st light emitting element part consists of a plurality of 1st light emitting elements 21, a plurality of 1st light emitting elements 21 are mutually connected by series connection, parallel connection, or these combinations. Similarly, when the second light emitting element portion includes a plurality of second light emitting elements 22, the plurality of second light emitting elements 22 are connected to each other by series connection, parallel connection, or a combination thereof.

第２発光素子部は第１発光素子部に対し並列に接続されている。すなわち、第２発光素子部は、第１発光素子部の第１端子と第２発光素子部の第１端子とが同電位となり、第１発光素子部の第２端子と第２発光素子部の第２端子とが同電位となるよう、第１発光素子部に対して接続される。第２発光素子部が第１発光素子部に対して並列に接続されるため、第１発光素子部を構成する第１発光素子２１と第２発光素子部を構成する第２発光素子２２とが直列に接続されることはない。なお、第１発光素子部が１つの第１発光素子からなる場合、第１発光素子部の第１端子は第１発光素子のカソード及びアノードのいずれか一方に相当し、第１発光素子部の第２端子は第１発光素子のカソード及びアノードのいずれか他方に相当する。同様に、第２発光素子部が１つの第２発光素子からなる場合、第２発光素子部の第１端子は第２発光素子のカソード及びアノードのいずれか一方に相当し、第２発光素子部の第２端子は第２発光素子のカソード及びアノードのいずれか他方に相当する。また、第１発光素子部が複数の第１発光素子からなる場合は、第１発光素子部の第１端子と第２端子との間で、複数の第１発光素子が直列接続、並列接続、またはこれらの組み合わせで互いに接続される。同様に、第２発光素子部が複数の第２発光素子からなる場合は、第２発光素子部の第１端子と第２端子との間で、複数の第２発光素子が直列接続、並列接続、またはこれらの組み合わせで互いに接続される。 The second light emitting element unit is connected in parallel to the first light emitting element unit. That is, in the second light emitting element unit, the first terminal of the first light emitting element unit and the first terminal of the second light emitting element unit have the same potential, and the second terminal of the first light emitting element unit and the second light emitting element unit The second terminal is connected to the first light emitting element portion so as to have the same potential. Since the second light emitting element part is connected in parallel to the first light emitting element part, the first light emitting element 21 constituting the first light emitting element part and the second light emitting element 22 constituting the second light emitting element part are provided. They are never connected in series. When the first light emitting element unit is composed of one first light emitting element, the first terminal of the first light emitting element unit corresponds to either the cathode or the anode of the first light emitting element, The second terminal corresponds to the other of the cathode and the anode of the first light emitting element. Similarly, when the second light emitting element unit is composed of one second light emitting element, the first terminal of the second light emitting element unit corresponds to either the cathode or the anode of the second light emitting element, and the second light emitting element unit The second terminal corresponds to the other of the cathode and the anode of the second light emitting element. Further, when the first light emitting element unit is composed of a plurality of first light emitting elements, the plurality of first light emitting elements are connected in series, in parallel, between the first terminal and the second terminal of the first light emitting element unit, Or they are connected to each other in combination. Similarly, when the second light emitting element unit is composed of a plurality of second light emitting elements, the plurality of second light emitting elements are connected in series or in parallel between the first terminal and the second terminal of the second light emitting element unit. Or a combination thereof.

第１発光素子２１は、青色に発光する発光素子、より具体的には４２０ｎｍ以上４８０ｎｍ未満の波長域に発光ピーク波長がある発光素子である。第２発光素子２２は、青緑色に発光する発光素子、より具体的には４８０ｎｍ以上５３０ｎｍ以下の波長域に発光ピーク波長がある発光素子である。 The first light-emitting element 21 is a light-emitting element that emits blue light, and more specifically, a light-emitting element having an emission peak wavelength in a wavelength region of 420 nm or more and less than 480 nm. The second light emitting element 22 is a light emitting element that emits blue-green light, more specifically, a light emitting element having an emission peak wavelength in a wavelength range of 480 nm to 530 nm.

第１発光素子２１と第２発光素子２２には、発光ダイオード（ＬＥＤ）などの、半導体を備えた半導体発光素子を用いることができる。半導体としては、インジウムを含む窒化物系半導体（Ｉｎ_ＸＡｌ_ＹＧａ_{１−Ｘ−Ｙ}Ｎ、０≦Ｘ、０≦Ｙ、Ｘ＋Ｙ≦１）等を用いることができる。第１発光素子２１と第２発光素子２２の形状は基台１０の形状や大きさに合わせて適宜選択することができる。第１発光素子２１と第２発光素子２２の平面形状は、例えば正方形状、長方形状、または六角形状等である。 As the first light emitting element 21 and the second light emitting element 22, a semiconductor light emitting element including a semiconductor such as a light emitting diode (LED) can be used. As the semiconductor, a nitride-based semiconductor containing indium _{_{_{(In X Al Y Ga 1-}}} X-Y N, 0 ≦ X, 0 ≦ Y, X + Y ≦ 1) , or the like can be used. The shapes of the first light emitting element 21 and the second light emitting element 22 can be appropriately selected according to the shape and size of the base 10. The planar shape of the first light emitting element 21 and the second light emitting element 22 is, for example, a square shape, a rectangular shape, a hexagonal shape, or the like.

第１発光素子の順方向電圧は第２発光素子の順方向電圧よりも低いことが好ましい。発光素子の順方向電圧は、フォワード電圧とも呼ばれ、発光素子が発光するために必要な最小電圧である。順方向電圧が低いほど内部抵抗が低く電流が流れやすくなるため、上記のようにすれば、第１発光素子部に流れる電流を第２発光素子部に流れる電流よりも大きくすることができる。このため、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させることが容易になる。 The forward voltage of the first light emitting element is preferably lower than the forward voltage of the second light emitting element. The forward voltage of the light emitting element is also called a forward voltage and is the minimum voltage necessary for the light emitting element to emit light. The lower the forward voltage, the lower the internal resistance and the easier the current flows. Thus, the current flowing through the first light emitting element portion can be made larger than the current flowing through the second light emitting element portion. For this reason, it becomes easy to make the first light emitting element part as the main light source sufficiently emit light with the desired light emission intensity while making the second light emitting element part as the auxiliary light source emit light with sufficient light emission intensity.

第１発光素子２１と第２発光素子２２はｐ電極２３、２４をそれぞれ備えていることが好ましく、ｐ電極２３、２４はパッド電極２３ａ、２４ａと補助電極２３ｂ、２４ｂとをそれぞれ有していることが好ましい。そして第１発光素子２１のｐ電極２３が有する補助電極２３ｂの面積は、第２発光素子２２のｐ電極２４が有する補助電極２４ｂの面積よりも大きいことが好ましく、この点は、特に第１発光素子２１と第２発光素子２２の平面形状が同一である場合（ほぼ同一である場合を含む。）に好ましい。このようにすれば、第１発光素子２１を流れる電流の流路の断面積が第２発光素子２２を流れる電流の流路の断面積よりも大きくなる。したがって、第１発光素子部に流れる電流を第２発光素子部に流れる電流よりも大きくすることができる。このため、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させることが容易になる。 The first light emitting element 21 and the second light emitting element 22 preferably include p electrodes 23 and 24, respectively, and the p electrodes 23 and 24 include pad electrodes 23a and 24a and auxiliary electrodes 23b and 24b, respectively. It is preferable. The area of the auxiliary electrode 23b included in the p electrode 23 of the first light emitting element 21 is preferably larger than the area of the auxiliary electrode 24b included in the p electrode 24 of the second light emitting element 22. It is preferable when the planar shapes of the element 21 and the second light emitting element 22 are the same (including the case where they are substantially the same). By doing so, the cross-sectional area of the flow path of the current flowing through the first light-emitting element 21 is larger than the cross-sectional area of the flow path of the current flowing through the second light-emitting element 22. Therefore, the current flowing through the first light emitting element unit can be made larger than the current flowing through the second light emitting element unit. For this reason, it becomes easy to make the first light emitting element part as the main light source sufficiently emit light with the desired light emission intensity while making the second light emitting element part as the auxiliary light source emit light with sufficient light emission intensity.

第１発光素子２１のｐ電極２３が有するパッド電極２３ａの高さは、第２発光素子２２のｐ電極２４が有するパッド電極２４ａの高さよりも低いことが好ましい。このようにすれば、第１発光素子２１のパッド電極２３ａを流れる電流の流路の全長が第２発光素子２２のパッド電極２４ａを流れる電流の流路の全長よりも短くなる。したがって、第１発光素子部に流れる電流を第２発光素子部に流れる電流よりも大きくすることができる。このため、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させることが容易になる。 The height of the pad electrode 23 a included in the p electrode 23 of the first light emitting element 21 is preferably lower than the height of the pad electrode 24 a included in the p electrode 24 of the second light emitting element 22. In this way, the total length of the current flow path flowing through the pad electrode 23 a of the first light emitting element 21 is shorter than the total length of the current flow path flowing through the pad electrode 24 a of the second light emitting element 22. Therefore, the current flowing through the first light emitting element unit can be made larger than the current flowing through the second light emitting element unit. For this reason, it becomes easy to make the first light emitting element part as the main light source sufficiently emit light with the desired light emission intensity while making the second light emitting element part as the auxiliary light source emit light with sufficient light emission intensity.

第１発光素子部と第２発光素子部は、基台１０上、より具体的には第１電極１１上に配置されている。発光装置１は、第１発光素子２１と第１電極１１とを接着する第１樹脂部４１と、第２発光素子２２と第１電極１１とを接着する第２樹脂部４２と、を備えていてもよい。この場合、第１樹脂部４１と第２樹脂部４２は放熱性が異なることが好ましく、特に第１樹脂部４１の放熱性は第２樹脂部４２の放熱性より低いことが好ましい。発光素子の電気抵抗は発光素子周辺の熱が上がるほど下がる傾向にあるため、このようにすれば、第１発光素子部に流れる電流を第２発光素子部に流れる電流よりも大きくすることができる。このため、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させることが容易になる。 The first light emitting element unit and the second light emitting element unit are disposed on the base 10, more specifically, on the first electrode 11. The light emitting device 1 includes a first resin portion 41 that bonds the first light emitting element 21 and the first electrode 11, and a second resin portion 42 that bonds the second light emitting element 22 and the first electrode 11. May be. In this case, it is preferable that the first resin portion 41 and the second resin portion 42 have different heat dissipation properties. In particular, the heat dissipation performance of the first resin portion 41 is preferably lower than that of the second resin portion 42. Since the electric resistance of the light emitting element tends to decrease as the heat around the light emitting element increases, the current flowing through the first light emitting element unit can be made larger than the current flowing through the second light emitting element unit. . For this reason, it becomes easy to make the first light emitting element part as the main light source sufficiently emit light with the desired light emission intensity while making the second light emitting element part as the auxiliary light source emit light with sufficient light emission intensity.

第１発光素子部の発光強度とは、第１発光素子部が１つの第１発光素子からなる場合は当該１つの第１発光素子の発光強度をいい、第１発光素子部が複数の第１発光素子からなる場合は複数の第１発光素子の発光強度の総和をいう。同様に、第２発光素子部の発光強度とは、第２発光素子部が１つの第２発光素子からなる場合は当該１つの第２発光素子の発光強度をいい、第２発光素子部が複数の第２発光素子からなる場合は複数の第２発光素子の発光強度の総和をいう。発光素子の発光強度は、発光素子の発光ピーク波長、発光スペクトル、発光素子の平面積、及び／又は発光素子が有する半導体積層体の種類等によって決まる。 The light emission intensity of the first light emitting element unit means the light emission intensity of the one first light emitting element when the first light emitting element unit consists of one first light emitting element, and the first light emitting element unit includes a plurality of first light emitting element units. In the case of a light emitting element, it means the sum of the light emission intensities of the plurality of first light emitting elements. Similarly, the light emission intensity of the second light emitting element unit means the light emission intensity of the one second light emitting element when the second light emitting element unit is composed of one second light emitting element, and there are a plurality of second light emitting element units. In the case of the second light emitting element, the sum of the emission intensities of the plurality of second light emitting elements is used. The light emission intensity of the light emitting element is determined by the emission peak wavelength of the light emitting element, the light emission spectrum, the planar area of the light emitting element, and / or the type of the semiconductor stacked body included in the light emitting element.

第１発光素子部の発光強度に対する第２発光素子部の発光強度の比は、０．２以上０．６以下であることが好ましい。これにより、第２発光素子部を補助光源として用いることができ、演色性の優れた発光装置を提供することができる。 The ratio of the light emission intensity of the second light emitting element part to the light emission intensity of the first light emitting element part is preferably 0.2 or more and 0.6 or less. Thereby, a 2nd light emitting element part can be used as an auxiliary light source, and the light-emitting device excellent in color rendering property can be provided.

第１発光素子部と第２発光素子部は、ワイヤボンディングやフリップチップ方式などにより、第１電極１１及び第２電極１２に電気的に接続することができる。本実施形態ではワイヤボンディングにより電気的に接続される。具体的には、第１発光素子部は、第１電極１１及び第２電極１２に対して第１ワイヤ３１によって電気的に接続され、第２発光素子部は、第１電極１１及び第２電極１２に対して第２ワイヤ３２によって電気的に接続される。 The first light emitting element portion and the second light emitting element portion can be electrically connected to the first electrode 11 and the second electrode 12 by wire bonding, a flip chip method, or the like. In this embodiment, they are electrically connected by wire bonding. Specifically, the first light emitting element unit is electrically connected to the first electrode 11 and the second electrode 12 by the first wire 31, and the second light emitting element unit includes the first electrode 11 and the second electrode. 12 is electrically connected by a second wire 32.

（第１ワイヤ３１、第２ワイヤ３２）
第１ワイヤ３１と第２ワイヤ３２は互いに異なる材料からなることが好ましい。また、第１ワイヤ３１の導電率と第２ワイヤ３２の導電率は互いに異なることが好ましく、特に第１ワイヤ３１の導電率は第２ワイヤ３２の導電率よりも大きいことが好ましい。また、第１ワイヤ３１の径は第２ワイヤ３２の径よりも大きいことが好ましい。また、第１ワイヤ３１の長さは第２ワイヤ３２の長さよりも短いことが好ましい。これらの構成の少なくとも１つによれば、第１発光素子部に流れる電流を第２発光素子部に流れる電流よりも大きくすることができる。このため、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させることが容易になる。 (First wire 31, second wire 32)
The first wire 31 and the second wire 32 are preferably made of different materials. The conductivity of the first wire 31 and the conductivity of the second wire 32 are preferably different from each other. In particular, the conductivity of the first wire 31 is preferably larger than the conductivity of the second wire 32. Further, the diameter of the first wire 31 is preferably larger than the diameter of the second wire 32. The length of the first wire 31 is preferably shorter than the length of the second wire 32. According to at least one of these configurations, the current flowing through the first light emitting element unit can be made larger than the current flowing through the second light emitting element unit. For this reason, it becomes easy to make the first light emitting element part as the main light source sufficiently emit light with the desired light emission intensity while making the second light emitting element part as the auxiliary light source emit light with sufficient light emission intensity.

（透光性部材５０、蛍光体６０）
透光性部材５０は、基台１０上に設けられ、第１発光素子部と第２発光素子部とを被覆する。透光性部材５０によれば、外力、埃、及び水分などから第１、第２発光素子部を保護することができる。 (Translucent member 50, phosphor 60)
The translucent member 50 is provided on the base 10 and covers the first light emitting element portion and the second light emitting element portion. The translucent member 50 can protect the first and second light emitting element portions from external force, dust, moisture, and the like.

透光性部材５０は蛍光体６０を含有している。第１発光素子部からの光による蛍光体６０の励起効率は、第２発光素子部からの光による蛍光体６０の励起効率よりも高い。実施形態１に係る発光装置１では、第１発光素子部の発光強度が第２発光素子部の発光強度よりも高いため、このようにすれば、透光性部材５０に含有される蛍光体６０を効率的に励起することができる。そのため、発光装置１の光取り出し効率を向上させることができる。 The translucent member 50 contains a phosphor 60. The excitation efficiency of the phosphor 60 by the light from the first light emitting element unit is higher than the excitation efficiency of the phosphor 60 by the light from the second light emitting element unit. In the light emitting device 1 according to the first embodiment, since the light emission intensity of the first light emitting element unit is higher than the light emission intensity of the second light emitting element unit, the phosphor 60 contained in the translucent member 50 is thus configured. Can be excited efficiently. Therefore, the light extraction efficiency of the light emitting device 1 can be improved.

蛍光体６０としては、例えば、セリウムで賦活されたイットリウム・アルミニウム・ガーネット、セリウムで賦活されたルテチウム・アルミニウム・ガーネット、ユウロピウム及び／又はクロムで賦活された窒素含有アルミノ珪酸カルシウム（カルシウムの一部をストロンチウムで置換可）、ユウロピウムで賦活されたサイアロン、ユウロピウムで賦活されたシリケート、ユウロピウムで賦活されたアルミン酸ストロンチウム、マンガンで賦活されたフッ化珪酸カリウムなどを用いることができる。 Examples of the phosphor 60 include yttrium-aluminum-garnet activated with cerium, lutetium-aluminum-garnet activated with cerium, nitrogen-containing calcium aluminosilicate activated with europium and / or chromium (a part of calcium is added). Sialon activated with europium, silicate activated with europium, strontium aluminate activated with europium, potassium fluorosilicate activated with manganese, and the like can be used.

透光性部材５０における蛍光体６０の含有量は、第１発光素子部の周辺と第２発光素子部の周辺とで異なることが好ましい。具体的には、第１発光素子部の周辺における蛍光体６０の含有量が第２発光素子部の周辺における蛍光体６０の含有量よりも大きいことが好ましい。前記のとおり発光素子の電気抵抗は発光素子周辺の熱が上がるほど下がる傾向にあるが、このようにすれば、第１発光素子部の周辺の熱抵抗が第１発光素子部の周辺の熱抵抗よりも大きくなり、第１発光素子部の周辺が第２発光素子部の周辺よりも高熱となる。したがって、第１発光素子部に流れる電流を第２発光素子部に流れる電流よりも大きくすることができる。このため、補助光源としての第２発光素子部を必要にして十分な発光強度で発光させつつ、主要光源としての第１発光素子部を所望の発光強度で十分に発光させることが容易になる。 The content of the phosphor 60 in the translucent member 50 is preferably different between the periphery of the first light emitting element portion and the periphery of the second light emitting element portion. Specifically, it is preferable that the content of the phosphor 60 around the first light emitting element portion is larger than the content of the phosphor 60 around the second light emitting element portion. As described above, the electrical resistance of the light-emitting element tends to decrease as the heat around the light-emitting element rises. By doing so, the thermal resistance around the first light-emitting element part becomes lower than that around the first light-emitting element part. Thus, the periphery of the first light emitting element unit becomes hotter than the periphery of the second light emitting element unit. Therefore, the current flowing through the first light emitting element unit can be made larger than the current flowing through the second light emitting element unit. For this reason, it becomes easy to make the first light emitting element part as the main light source sufficiently emit light with the desired light emission intensity while making the second light emitting element part as the auxiliary light source emit light with sufficient light emission intensity.

透光性部材５０は蛍光体６０だけではなくフィラーを含有することもできる。フィラーとしては、具体的に、ガラスファイバー、ワラストナイト等の繊維状フィラー、窒化アルミニウム、カーボン等の無機フィラー、シリカ、酸化チタン、酸化亜鉛、酸化ジルコニウム、酸化マグネシウム、ガラス、蛍光体６０と無機物の結合材との焼結体等を用いることができる。透光性部材５０がフィラーを含有する場合には、上記した蛍光体６０の含有量の場合と同様の理由により、蛍光体６０の含有量とフィラーの含有量の合計量が、第１発光素子部の周辺と第２発光素子部の周辺とで異なることが好ましい。具体的には、第１発光素子部の周辺における蛍光体６０の含有量とフィラーの含有量の合計量が第２発光素子部の周辺における蛍光体６０の含有量とフィラーの含有量の合計量よりも大きいことが好ましい。 The translucent member 50 can contain not only the phosphor 60 but also a filler. Specific examples of fillers include fiber fillers such as glass fiber and wollastonite, inorganic fillers such as aluminum nitride and carbon, silica, titanium oxide, zinc oxide, zirconium oxide, magnesium oxide, glass, phosphor 60 and inorganic substances. For example, a sintered body with a binder can be used. When the translucent member 50 contains a filler, for the same reason as in the case of the content of the phosphor 60 described above, the total amount of the content of the phosphor 60 and the content of the filler is the first light emitting element. It is preferable that the periphery of the portion differs from the periphery of the second light emitting element portion. Specifically, the total amount of the phosphor 60 and the filler content in the vicinity of the first light emitting element portion is the total amount of the phosphor 60 and the filler content in the vicinity of the second light emitting element portion. Is preferably larger.

発光装置１はツェナーダイオードなどの保護素子７０を備えていてもよい。保護素子７０を備える場合には、第１発光素子部や第２発光素子部に過大な電流が流れることが抑制される。 The light emitting device 1 may include a protective element 70 such as a Zener diode. When the protective element 70 is provided, it is possible to prevent an excessive current from flowing through the first light emitting element unit and the second light emitting element unit.

［実施形態２に係る発光装置２］
図２Ａは実施形態２に係る発光装置２の模式的平面図であり、図２Ｂは実施形態２に係る発光装置２の回路図である。図２Ａ、図２Ｂでは保護素子７０の図示を省略している。図２Ａ、図２Ｂに示すように、発光装置２は、第１発光素子部が互いに直列に接続される複数の第１発光素子２１を備える点で、上記した発光装置１と相違する。その他の点は発光装置１と同様の構成を有する。発光装置２によれば、主要光源である複数の第１発光素子２１を互いに直列に接続させつつ、発光装置１と同様の効果を得ることができる。 [Light Emitting Device 2 According to Embodiment 2]
2A is a schematic plan view of the light-emitting device 2 according to Embodiment 2, and FIG. 2B is a circuit diagram of the light-emitting device 2 according to Embodiment 2. In FIG. 2A and FIG. 2B, illustration of the protective element 70 is omitted. 2A and 2B, the light-emitting device 2 is different from the above-described light-emitting device 1 in that the first light-emitting element unit includes a plurality of first light-emitting elements 21 connected in series. Other points have the same configuration as the light emitting device 1. According to the light emitting device 2, the same effect as that of the light emitting device 1 can be obtained while connecting the plurality of first light emitting elements 21 that are main light sources in series with each other.

［実施形態３に係る発光装置３］
図３Ａは実施形態３に係る発光装置３の模式的平面図であり、図３Ｂは実施形態３に係る発光装置３の回路図である。図３Ａ、図３Ｂでは保護素子７０の図示を省略している。図３Ａ、図３Ｂに示すように、発光装置３は、第１発光素子部が互いに並列に接続される複数の第１発光素子２１を備える点で、上記した発光装置１と相違する。その他の点は発光装置１と同様の構成を有する。発光装置３によれば、主要光源である第１発光素子２１を互いに並列に接続させつつ、発光装置１と同様の効果を得ることができる。 [Light Emitting Device 3 According to Embodiment 3]
3A is a schematic plan view of the light-emitting device 3 according to Embodiment 3, and FIG. 3B is a circuit diagram of the light-emitting device 3 according to Embodiment 3. In FIG. 3A and FIG. 3B, illustration of the protective element 70 is omitted. As shown in FIGS. 3A and 3B, the light-emitting device 3 is different from the above-described light-emitting device 1 in that the first light-emitting element unit includes a plurality of first light-emitting elements 21 connected in parallel to each other. Other points have the same configuration as the light emitting device 1. According to the light emitting device 3, the same effect as that of the light emitting device 1 can be obtained while the first light emitting elements 21 as the main light sources are connected in parallel to each other.

［実施形態４に係る発光装置４］
図４Ａは実施形態４に係る発光装置４の模式的平面図であり、図４Ｂは実施形態４に係る発光装置４の回路図である。図４Ａ、図４Ｂでは保護素子７０の図示を省略している。図４Ａ、図４Ｂに示すように、発光装置４は、第１発光素子部が互いに並列に接続される複数の第１発光素子２１を備え、平面視において複数の第１発光素子２１の間に第２発光素子部が配置される点で、上記した発光装置１と相違する。その他の点は発光装置１と同様の構成を有する。発光装置４によれば、主要光源である第１発光素子２１を互いに並列に接続させつつ、発光装置１と同様の効果を得ることができる。また、発光装置４によれば、同じ色の光を発する２つの第１発光素子２１の間に、異なる色の光を発する第２発光素子２２を配置することで、発光装置の色ムラを低減することができる。 [Light Emitting Device 4 According to Embodiment 4]
4A is a schematic plan view of the light-emitting device 4 according to Embodiment 4, and FIG. 4B is a circuit diagram of the light-emitting device 4 according to Embodiment 4. In FIG. 4A and FIG. 4B, illustration of the protective element 70 is omitted. As shown in FIGS. 4A and 4B, the light emitting device 4 includes a plurality of first light emitting elements 21 in which the first light emitting element portions are connected in parallel to each other, and between the plurality of first light emitting elements 21 in plan view. It differs from the above-described light emitting device 1 in that the second light emitting element portion is arranged. Other points have the same configuration as the light emitting device 1. According to the light-emitting device 4, the same effect as the light-emitting device 1 can be acquired, connecting the 1st light emitting element 21 which is a main light source in parallel mutually. Further, according to the light emitting device 4, the color unevenness of the light emitting device is reduced by disposing the second light emitting element 22 that emits light of different colors between the two first light emitting elements 21 that emit light of the same color. can do.

［実施形態５に係る発光装置５］
図５Ａは実施形態５に係る発光装置５の模式的平面図であり、図５Ｂは実施形態５に係る発光装置５の回路図である。図５Ａ、図５Ｂでは保護素子７０の図示を省略している。図５Ａ、図５Ｂに示すように、発光装置５は、第１発光素子部が互いに直列に接続される複数の第１発光素子２１を備えるとともに、第２発光素子部が互いに並列に接続される複数の第２発光素子２２を備える点で、上記した発光装置１と相違する。その他の点は発光装置１と同様の構成を有する。発光装置５によれば、主要光源である第１発光素子２１を互いに直列に接続させつつ、発光装置１と同様の効果を得ることができる。また、発光装置５によれば、同じ色の光を発する２つの第１発光素子２１の間に、異なる色の光を発する第２発光素子２２を配置することで、発光装置の色ムラを低減することができる。 [Light Emitting Device 5 According to Embodiment 5]
5A is a schematic plan view of the light-emitting device 5 according to Embodiment 5, and FIG. 5B is a circuit diagram of the light-emitting device 5 according to Embodiment 5. The protection element 70 is not shown in FIGS. 5A and 5B. As shown in FIGS. 5A and 5B, the light emitting device 5 includes a plurality of first light emitting elements 21 in which the first light emitting element portions are connected in series with each other, and the second light emitting element portions are connected in parallel with each other. It differs from the above-described light emitting device 1 in that it includes a plurality of second light emitting elements 22. Other points have the same configuration as the light emitting device 1. According to the light emitting device 5, the same effect as that of the light emitting device 1 can be obtained while the first light emitting elements 21 that are main light sources are connected in series with each other. Further, according to the light emitting device 5, the color unevenness of the light emitting device is reduced by disposing the second light emitting element 22 that emits light of different colors between the two first light emitting elements 21 that emit light of the same color. can do.

［実施形態６に係る発光装置６］
図６Ａは実施形態６に係る発光装置６の模式的平面図であり、図６Ｂは実施形態６に係る発光装置６の回路図である。図６Ａ、図６Ｂでは保護素子７０の図示を省略している。図６Ａ、図６Ｂに示すように、発光装置６は、第１発光素子部が互いに並列に接続される複数の第１発光素子２１を備えるとともに、第２発光素子部が互いに直列に接続される複数の第２発光素子２２を備える点で、上記した発光装置１と相違する。その他の点は発光装置１と同様の構成を有する。発光装置６によれば、主要光源である第１発光素子２１を互いに並列に接続させつつ、発光装置１と同様の効果を得ることができる。また、発光装置６によれば、同じ色の光を発する２つの第１発光素子２１の間に、異なる色の光を発する第２発光素子２２を配置することで、発光装置の色ムラを低減することができる。 [Light Emitting Device 6 According to Embodiment 6]
6A is a schematic plan view of the light-emitting device 6 according to Embodiment 6, and FIG. 6B is a circuit diagram of the light-emitting device 6 according to Embodiment 6. 6A and 6B, the protection element 70 is not shown. 6A and 6B, the light-emitting device 6 includes a plurality of first light-emitting elements 21 in which the first light-emitting element units are connected in parallel to each other, and the second light-emitting element units are connected in series to each other. It differs from the above-described light emitting device 1 in that it includes a plurality of second light emitting elements 22. Other points have the same configuration as the light emitting device 1. According to the light-emitting device 6, the same effect as the light-emitting device 1 can be acquired, connecting the 1st light emitting element 21 which is a main light source in parallel mutually. Further, according to the light emitting device 6, the color unevenness of the light emitting device is reduced by disposing the second light emitting element 22 that emits light of different colors between the two first light emitting elements 21 that emit light of the same color. can do.

以上、実施形態について説明したが、これらは本発明を何ら限定するものではない。 As mentioned above, although embodiment was described, these do not limit this invention at all.

１−６発光装置
１０基台（樹脂パッケージ）
１１第１電極
１２第２電極
１４金属板
１５樹脂部
１６第１メッキ層
１７第２メッキ層
２１第１発光素子
２２第２発光素子
２３、２４ｐ電極
２３ａ、２４ａパッド電極
２３ｂ、２４ｂ補助電極
３１第１ワイヤ
３２第２ワイヤ
４１第１樹脂部
４２第２樹脂部
５０透光性部材
６０蛍光体
７０保護素子 1-6 Light Emitting Device 10 Base (Resin Package)
11 1st electrode 12 2nd electrode 14 Metal plate 15 Resin part 16 1st plating layer 17 2nd plating layer 21 1st light emitting element 22 2nd light emitting element 23, 24 p electrode 23a, 24a Pad electrode 23b, 24b Auxiliary electrode 31 First wire 32 Second wire 41 First resin part 42 Second resin part 50 Translucent member 60 Phosphor 70 Protection element

Claims

The base,
A first light-emitting element unit comprising at least one first light-emitting element having an emission peak wavelength in a wavelength region of 420 nm or more and less than 480 nm, and disposed on the base;
A second light emitting element unit comprising at least one second light emitting element having a light emission peak wavelength in a wavelength range of 480 nm or more and 530 nm or less, disposed on the base, and connected in parallel to the first light emitting element unit When,
A translucent member including a phosphor having excitation efficiency by light from the first light emitting element higher than excitation efficiency by light from the second light emitting element,
The light emitting device has a light emission intensity of the first light emitting element portion higher than that of the second light emitting element portion.

The light emitting device according to claim 1, wherein a forward voltage of the first light emitting element is lower than a forward voltage of the second light emitting element.

The first light emitting device and the second light emitting device each include a p-electrode,
The p-electrode has a pad electrode and an auxiliary electrode,
3. The light emitting device according to claim 1, wherein an area of the auxiliary electrode included in the p electrode of the first light emitting element is larger than an area of the auxiliary electrode included in the p electrode of the second light emitting element.

The base has a first electrode and a second electrode,
The first light emitting element unit is disposed on the first electrode and electrically connected to the first electrode and the second electrode by a first wire,
The second light emitting element unit is disposed on the first electrode and electrically connected to the first electrode and the second electrode by a second wire.
The light-emitting device according to claim 1.

The light emitting device according to claim 4, wherein the first wire and the second wire are made of different materials.

The light emitting device according to claim 4 or 5, wherein the conductivity of the first wire is larger than the conductivity of the second wire.

A first resin portion for bonding the first light emitting element to the first electrode;
A second resin part for adhering the second light emitting element to the first electrode,
The light emitting device according to claim 4, wherein the first resin portion and the second resin portion have different heat dissipation properties.

The light-emitting device according to claim 1, wherein the translucent member is provided on the base and covers the first light-emitting element part and the second light-emitting element part.

9. The light emitting device according to claim 1, wherein a content of the phosphor in the translucent member is different between a periphery of the first light emitting element portion and a periphery of the second light emitting element portion.